Alternatives to VaxVoIP Agent AI SDK
Compare VaxVoIP Agent AI SDK alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to VaxVoIP Agent AI SDK in 2026. Compare features, ratings, user reviews, pricing, and more from VaxVoIP Agent AI SDK competitors and alternatives in order to make an informed decision for your business.
-
1
Retell AI
Retell AI
Retell AI is an advanced platform that enables businesses to build, test, deploy, and monitor AI-powered voice agents for seamless customer interactions. With features like call transfer, appointment scheduling, and knowledge base synchronization, it allows for the creation of lifelike conversations with minimal latency. The platform supports integration with various telephony systems and offers multilingual capabilities, making it suitable for global operations. Retell AI's scalable infrastructure ensures reliable performance, handling high call volumes efficiently. Additionally, it provides robust monitoring tools to analyze call performance and user sentiment, facilitating continuous improvement of voice agents. -
2
Dograh
Dograh
Dograh is an open source, self-hostable voice agent platform with a no-code workflow builder for creating production voice agents. Teams can choose their own inbound channels, speech-to-text, LLM, text-to-speech, and telephony providers, or replace the traditional cascade with speech-to-speech models for direct audio-in, audio-out conversations with natural turn-taking, interruption handling, and low latency. The platform supports inbound and outbound calling, widgets, telephony integrations, observability, traces, real-time analytics, hybrid pre-recorded voice plus TTS, and more than 70 languages. Its MCP server lets Claude Code, Cursor, OpenClaw, Codex, and other agent runtimes create, modify, and deploy voice agents directly from development environments. Dograh can run on your own servers, inside a private cloud or VPC, or in a managed environment, with support for models hosted entirely within your perimeter.Starting Price: 1¢ per minute -
3
Grok Voice Agent Builder
SpaceXSI
Grok Voice Agent Builder is xAI’s no-code platform for configuring production voice agents on Grok Voice in under two minutes. It is built for operators and developers who want high-volume voice agents without building the surrounding stack from scratch, bringing telephony, knowledge retrieval, tools, guardrails, MCPs, and observability into one place. Instead of stitching together separate speech-to-text, language model, and text-to-speech APIs, Voice Agent Builder uses one interface on a speech-to-speech path built for Grok Voice, tightly coupled to the model rather than assembled from three different systems. Users can write a plain-language description of how calls should flow, attach documents, connect tools, set guardrails, and move quickly from zero to a working agent. It can retrieve from uploaded knowledge bases in common formats such as plain text, Markdown, Word, PowerPoint, Excel, HTML, JSON, and others.Starting Price: $30 per month -
4
VoiceBun
VoiceBun
VoiceBun is an open source, no-code voice-agent builder that lets you create, configure, and deploy AI-powered conversational assistants entirely via natural-language prompts. It combines speech-to-text, large-language models, and text-to-speech into a unified platform where you define your agent’s goals, initial greeting, tool integrations and data sources; VoiceBun automatically generates the underlying conversational logic, state management and API connectors needed to handle inbound and outbound calls for support, scheduling, lead qualification and more. The web-based interface gives you mobile-friendly access and isolated deployments through user-specific subdomains, while built-in analytics surface call transcripts, usage metrics, success rates, and sentiment trends. Integration includes options for telephony, webhook actions for external workflows, and role-based access controls with encrypted credentials for enterprise security.Starting Price: $20 per month -
5
ECHO by Zencia AI
Zencia AI
ECHO by Zencia is a SaaS platform for building, deploying, and managing production-ready AI voice agents. Create AI receptionists, sales agents, customer support assistants, recruiters, or custom AI voice employees without the complexity of integrating telephony, speech-to-text, large language models, text-to-speech, and workflow automation from scratch. ECHO combines persistent memory, custom knowledge bases, knowledge-gap detection, and intelligent workflows to deliver natural, context-aware voice conversations. Connect your CRM, calendars, and business tools to automate inbound and outbound calls, qualify leads, schedule appointments, answer customer queries, and execute business actions from a single dashboard. With multilingual support, analytics, call history, and centralized agent management, ECHO enables startups, SMBs, and enterprises to deploy scalable Voice AI that remembers context, takes action, and helps automate business communication. -
6
FonadaLabs
FonadaLabs
FonadaLabs is a voice AI platform that provides enterprise-grade infrastructure and APIs for building voice agents on Indian telephony networks. The platform offers a complete voice pipeline that includes telephony hosting, noise cancellation, speech recognition, voice models, and text-to-speech capabilities within a unified API environment. FonadaLabs supports over 23 Indian languages with speech recognition optimized for regional accents and telephony use cases. The platform enables real-time voice streaming with ultra-low latency, enterprise security, and India-based data residency for compliance and sovereignty requirements. Businesses can also leverage specialized voice agent language models, tool-calling support, and natural-sounding Indian voice generation for customer interactions and automation.Starting Price: $5 -
7
OpenAI Realtime API
OpenAI
The OpenAI Realtime API is a newly introduced API, announced in 2024, that allows developers to create applications that facilitate real-time, low-latency interactions, such as speech-to-speech conversations. This API is designed for use cases like customer support agents, AI voice assistants, and language learning apps. Unlike previous implementations that required multiple models for speech recognition and text-to-speech conversion, the Realtime API handles these processes seamlessly in one call, enabling applications to handle voice interactions much faster and with more natural flow. -
8
Vision Agents
Stream
Vision Agents is an open source Python framework for building low-latency voice and video AI agents with any model. It lets developers plug in LLM, speech, and vision models from more than 25 providers and ship real-time agents for telehealth, voice support, live coaching, video analysis, interactive avatars, security monitoring, sports commentary, and other multimodal applications. It is designed to help teams build agents that can listen, speak, see, process media, call tools, and respond in real time while running on Stream’s global edge network with sub-500ms latency. Developers can build a first agent in minutes, using a small Python setup with Gemini Realtime, OpenAI, Deepgram, ElevenLabs, Stream, or other supported providers. Vision Agents supports both real-time speech-to-speech models and custom STT/LLM/TTS pipelines, giving teams either the fastest path to a working voice agent or full control over speech recognition, language reasoning, text-to-speech, etc.Starting Price: Free -
9
VaxVoIP SIP Phone SDK
VaxSoft
VaxVoIP SIP Phone SDK helps developers build branded SIP softphones and VoIP applications for Windows, Android, iPhone, and iPad. It provides SIP signaling, media handling, and call-control APIs for voice and video, messaging, presence, multiple SIP accounts, and concurrent call lines. Features include conferencing, call hold, transfer and forwarding, WAV call recording, SIPREC client support, echo cancellation, jitter buffering, and answering-machine detection. Sample projects cover C#, VB.NET, WPF, Visual C++, Delphi, Java, Objective-C, and Swift, with platform-specific documentation. The SDK connects applications to standards-based SIP servers, IP-PBX systems, gateways, and telephony providers. Use cases include softphones, mobile VoIP apps, call-center tools, auto-dialers, and embedded business communications. A fully functional 30-day trial is available; annual licenses are sold separately for Windows, Android, and iOS.Starting Price: $2,640/year -
10
Leadlock
Leadlock
Leadlock is a speech-to-speech voice AI platform built specifically for GoHighLevel agencies, helping them answer every call, qualify leads, book appointments, and update GHL pipelines in real time. Unlike traditional voice AI stacks that chain speech-to-text, an LLM, and text-to-speech, it supports true multimodal speech-to-speech through OpenAI Realtime and Gemini Live, alongside xAI Grok and ElevenLabs options, enabling sub-second latency, natural turn-taking, and interruptions. Agencies can choose from more than 72 voices across multiple providers and select different models for different agents and use cases. Native GoHighLevel integration connects contacts, calendars, pipelines, opportunities, tags, custom fields, workflows, and sub-accounts without middleware or Zapier-style glue. Before answering, agents can pull caller history and CRM context to personalize conversations from the first ring.Starting Price: $97 per month -
11
Voice Logica
Voice Logica
Voice Logica is a cloud-based AI voice-agent and business telephony platform for organizations handling customer calls. It answers inbound calls and can place outbound calls for reminders, follow-ups and campaigns. AI agents can respond to questions, route or transfer callers, schedule or update appointments, retrieve customer and order information, and create tasks or tickets through connected business systems. The service records and transcribes calls and provides summaries and analytics. It supports Greek- and English-language conversations and connects with calendar, CRM, ERP and e-commerce tools, with use cases including customer service, booking, order inquiries, lead follow-up and call handling across healthcare, hospitality, retail, insurance, property and education.Starting Price: €49/month -
12
Tunk.ai
Tunk.ai
Tunk.ai is a multilingual AI voice agent platform that enables businesses to build, deploy, and manage intelligent voice agents for customer interactions and business workflows. With its Anchor agent builder, businesses can create AI voice agents using prompts and connect them to telephony, APIs, CRMs, MCP servers, external tools, and business systems. Tunk.ai supports speech-to-text, text-to-speech, real-time voice conversations, SIP and telephony integrations, tool calling, function calling, and multiple AI and speech providers. Agents can use connected tools to retrieve information, perform actions, update systems, and automate workflows. Tunk.ai can automate customer support, sales, lead qualification, appointment scheduling, recruitment, healthcare workflows, collections, reminders, and contact-center operations. The platform supports multiple languages, customizable workflows, APIs, integrations, and scalable infrastructure for SMB and enterprise deployments.Starting Price: $0.05 per minute -
13
Talkif
Talkif
Talkif is a browser-based voice AI platform for creating and operating agents on business phone lines. Teams design call flows in a visual builder, test agents, and deploy them to answer inbound calls or place outbound calls. Agents can respond to customer questions, qualify leads, collect information, make API calls, and book appointments. For calls requiring a person, Talkif supports routing and warm or cold transfers with caller context. The service includes call management, transcripts, configurable recording and retention controls, and itemized usage costs. Organizations can select speech, language-model, voice, and telephony providers, use Talkif phone numbers, or connect a SIP carrier. API and webhook capabilities support connections to business systems, while documented workflows include lead follow-up, appointment handling, reminders, surveys, and customer support. -
14
Sarj AI
Sarj AI
Sarj AI is a KSA-based voice-agent platform that automates complex, multi-step interactions. Its Arabic-first voice and chat AI agents sell, collect payments, schedule appointments, qualify leads, provide customer support, and trigger workflows across CRM, banking, healthcare, billing, telephony, and messaging systems. Sarj supports nine Arabic dialects, enterprise security and data-residency requirements, SaaS and on-premise deployment, document intelligence, workflow automation, and large-scale outbound campaigns. -
15
Intervo.ai
Intervo.ai
Intervo is an open source, enterprise-grade voice and chat AI agent platform designed to automate real-time customer interactions across voice and text channels. It allows businesses to build, train, and deploy custom agents in minutes without code; you define the agent’s purpose, upload domain knowledge (documents, files), choose a voice engine (e.g., ElevenLabs, Azure), and publish it to embedded channels. Its agents support use cases like lead qualification, customer support, AI receptionist/scheduling, interactive product assistance, and internal help agents (for HR, IT, etc.). They can integrate with telephony via Twilio, connect to multiple LLM backends (OpenAI, Claude, Gemini), orchestrate AI workflows, and embed on websites as widgets. It emphasizes scalability, compliance, and flexibility, letting organizations embed context-aware conversational agents that understand complex queries, route calls, and interact via speech or chat.Starting Price: $10 per month -
16
Boson AI
Boson AI
Boson AI provides voice agents powered by foundation audio models, built to run in business workflows and learn from every call. Higgs Realtime enables live voice agents for support lines, sales calls, and product assistants that listen, reason, call tools, and respond in real time with low latency and natural speech-to-speech interaction. Higgs Audio and Avatar extend these capabilities with text-to-speech, speech-to-text, voice cloning, sentiment detection, and avatar generation, producing natural speech while understanding tone, emotion, and intent. The models support high-accuracy multilingual speech recognition, real-time translation, and expressive voice generation, while sentiment signals can improve routing, analytics, and context-aware agent behavior. Designed for real-world production, the platform emphasizes quality, latency, reliability, and flexible deployment across managed and self-serve environments. -
17
Telenow
Telenow
Telenow is a voice AI platform for building and running production voice agents. Teams can create agents with a single prompt or a structured multi-context flow builder, attach phone numbers, and handle real inbound and outbound calls. The platform is model-agnostic: plug in Groq, Gemini, or OpenAI LLMs, and TTS from ElevenLabs, Cartesia, Sarvam, or Polly. It ships with 7 telephony integrations (Plivo, Exotel, Twilio and more), supports Hindi and English voices with automatic language switching, and integrates with Shopify, WordPress, n8n, and MCP. Open-source SDKs are available for developers. -
18
Dessa
Block
Dessa is Block's speech-to-speech artificial intelligence model for conversational voice research and applications. It takes audio input and produces audio output directly, without converting speech into text as an intermediate step. Trained from scratch on human conversation rather than text, the model supports full-duplex interaction, listening and speaking at the same time, and runs locally on a MacBook Pro with an M4 Max chip or better. It captures conversational cues such as emotion, sarcasm, laughter, pauses, and turn-taking that can be lost in text-based pipelines. Dessa is intended for AI safety researchers and developers studying voice-model behavior, privacy, and real-time interaction. It is a speech model for research and development, not a general-purpose business application or hosted voice-agent platform. -
19
VoiceOI
VoiceOI
VoiceOI is a web-based platform for building and running outbound voice bots for call centers, BPOs, lead-generation teams and other outbound operations. Users create recorded-voice bots with branching scripts or conversational AI agents in a visual builder, test call flows in a simulator, and run campaigns through VICIdial or a SIP carrier. Bots can qualify leads, detect answering machines, respond to spoken do-not-call requests and transfer qualified callers to human agents. The platform supports bulk provisioning and outcome write-back in VICIdial, campaign management, call records and transcripts, optional AI-voice disclosure, and Google Sheets exports on eligible plans. Pricing is prepaid per concurrent bot, with carrier charges billed separately. VoiceOI is designed for outbound calling; bot features, telephony options and workflows vary by plan.Starting Price: $30/month/bot -
20
UnlimCall
UnlimCall
UnlimCall is an AI-powered voice automation platform that helps businesses automate phone-based customer interactions using intelligent voice agents. The platform supports both inbound and outbound calling for lead qualification, appointment scheduling, customer support, follow-ups, surveys, and sales outreach. UnlimCall combines conversational AI, telephony infrastructure, call routing, call recording, analytics, and workflow automation in a single solution. AI voice agents can engage in natural conversations, answer questions, collect information, transfer calls to human agents, and integrate with external systems through APIs and webhooks. Key features include automated outbound calling, call recording, conversation analytics, SIP connectivity, CRM integrations, reporting dashboards, and developer APIs. UnlimCall helps organizations scale customer communications, improve operational efficiency, and deliver consistent customer experiences through AI-powered voice interactions.Starting Price: $396/month -
21
Amazon Nova Sonic
Amazon
Amazon Nova Sonic is a state-of-the-art speech-to-speech model that delivers real-time, human-like voice conversations with industry-leading price performance. It unifies speech understanding and generation into a single model, enabling developers to create natural, expressive conversational AI experiences with low latency. Nova Sonic adapts its responses based on the prosody of input speech, such as pace and timbre, resulting in more natural dialogue. It supports function calling and agentic workflows to interact with external services and APIs, including knowledge grounding with enterprise data using Retrieval-Augmented Generation (RAG). It provides robust speech understanding for American and British English across various speaking styles and acoustic conditions, with additional languages coming soon. Nova Sonic handles user interruptions gracefully without dropping conversational context and is robust to background noise. -
22
EaseDial
EaseDial
EaseDial is a cloud communications platform designed to streamline business telephony and customer engagement workflows. It provides organizations with scalable voice and messaging capabilities to manage inbound and outbound communications efficiently. Key features include intelligent call routing to distribute calls based on agent availability and skill sets, automated dialing to increase outbound call volume, and seamless workflow integrations with popular CRM platforms. EaseDial also offers real-time dashboards and historical reporting tools to monitor agent performance and connection rates. By centralizing communication channels and automating routine telephony tasks, EaseDial helps sales and customer service teams improve operational efficiency.Starting Price: $10/month -
23
ThunderPhone
ThunderPhone
ThunderPhone is a full-stack voice AI platform built to handle real-world phone calls with high accuracy, strong instruction following, and natural conversation. It fuses multiple transcripts with direct audio-to-LLM input so that addresses, spellings, accents, background noise, and mumbled speech are less likely to turn into wrong answers. Agents can place and receive calls, run bulk outbound campaigns with pacing and retries, operate over real telephony or inside websites and apps, and communicate in more than 40 languages with support for accents, mixed-language calls, and mid-conversation language switching. It handles interruptions, backchannels, cross-talk, voicemail, screeners, keypad input, warm and cold transfers, and human handoffs while preserving context. Built-in retrieval lets agents answer from uploaded documents, while live supervision allows operators to watch calls and whisper guidance to the AI.Starting Price: 2¢ per minute -
24
TopCalls
Wisdom Sphere LLC
TopCalls is a managed AI voice-calling platform for sales teams automating repeatable phone workflows. It configures and operates agents for outbound lead qualification, prospect follow-up, contact reactivation, appointment setting, inbound response, and scheduled callbacks. Agents conduct conversations using customer-defined objectives and criteria, capture call outcomes and transcripts, and route qualified leads or callbacks to a human team. TopCalls books meetings in supported calendars and synchronizes call data with CRM systems. Teams can manage agents, campaigns, contacts, and call records through a REST API and receive call-event webhooks, or use documented integrations and automation tools. Campaign setup and monitoring are part of the managed service, making TopCalls suited to organizations with recurring calling workflows that prefer an implemented service over a self-service voice-agent builder.Starting Price: $0.35/min -
25
Eleven Realtime
ElevenLabs
Eleven Realtime is a developer-facing speech-to-speech API for adding live voice conversations to applications and AI agents. It combines speech recognition, turn-taking, language-model reasoning, and voice generation, with Mini and Max model options for different conversational needs. Developers can use the models through the Realtime API or select them in ElevenAgents. The streaming interface is designed for interactive voice experiences, including assistants, customer support, tutors, and interactive characters. Agent configurations can include prompts, voices, tools, knowledge bases, and conversation flows. Realtime usage is billed per minute plus model input and output tokens. The product is intended for developers and organizations building real-time conversational applications and voice-enabled customer experiences. -
26
AvaritCall
Avarit.ai
AvaritCall is an AI voice agent platform for automating inbound and outbound business calls. It enables businesses to automate customer support, sales, lead qualification, appointment scheduling, reminders, confirmations, and other call center workflows. AvaritCall supports 70+ languages, integrates with CRM, ERP, e-commerce, and other business systems through APIs, and uses proprietary real-time voice orchestration and telephony infrastructure to deliver fast, natural AI phone conversations.Starting Price: $0.08 -
27
Aethex
Aethex
AethexAI is the voice AI stack for emerging markets, built for end-to-end voice agents localized for your market. It brings together infrastructure, models, and deployment in one environment, with proprietary Kora 1 models trained on real conversational speech and human-labeled data across emerging markets. The Kora 1 Engine is designed for real speech, native tool calling, workflow-aware routing, dedicated infrastructure, dialect-aware interactions, and sub-500ms turn-taking. Teams can design, deploy, and manage voice agents that handle calls, messages, and workflows across support, sales, onboarding, and collections, integrated with the systems they already run. It moves from hello to resolution, with agents that can read and write data, trigger actions, and close loops inside existing systems rather than alongside them. Agent Studio lets users design conversation flows, set guardrails, configure personas, and build inbound or outbound agents with no code required.Starting Price: $3 per month -
28
Calldone
Easital Technologies Ltd
Calldone is a managed AI voice-agent service that businesses use to answer inbound calls and place outbound calls. Its team configures and trains agents for each organization, using business information and FAQs to handle common questions, qualify inquiries, schedule appointments, and route calls to staff when needed. A web dashboard lets teams review call recordings, transcripts, summaries, and outcomes. Plans include pooled call minutes, agent limits, CRM integration allowances, and usage-based charges for minutes beyond the included balance; setup and agent training are included. Calldone is designed for phone-intensive organizations, including real estate, healthcare, legal, insurance, home services, accounting, and hospitality businesses, and supports reminders, follow-ups, campaigns, SMS, call transfers, calendar bookings, and webhooks.Starting Price: $49 -
29
Grok Voice 3.0
SpaceXSI
Grok Voice 3.0 is a speech-to-speech model offered through the Grok Voice Agent API for developers building real-time voice applications. It accepts audio and text and returns spoken audio or text through a WebSocket session, supporting conversational turn-taking, interruptions, and function calling. Developers can connect the model to custom functions and server-side tools, including web search, X search, collections, and remote MCP servers. The API is intended for interactive voice agents such as customer-support and service-call experiences, and is also used for voice interactions in Tesla vehicles and Grok Bot. Billing is usage-based, with audio charged per minute and text input events billed separately. The API documentation includes setup instructions and examples for Python and JavaScript clients.Starting Price: $0.08/min -
30
HuskyVoiceAI
HuskyVoiceAI
HuskyVoiceAI is a multilingual Voice AI platform for automating inbound and outbound business calls. Companies use it for AI reception, lead qualification, appointment booking, recruitment screening, customer support, reminders, follow-ups, and other voice-driven workflows. AI voice agents can take actions during and after calls, including updating CRMs, checking availability, booking appointments, triggering APIs, sending WhatsApp or email messages, and escalating to humans. HuskyVoiceAI supports 30+ languages, business phone numbers, SIP and BYOC telephony, workflow automation, integrations, call recordings, transcripts, summaries, and analytics. It is designed for businesses that want AI calling connected to real operational workflows. -
31
Babelbeez
Babelbeez
Babelbeez is a browser-native voice AI designed to function as an automation trigger. It allows website visitors to speak naturally with an AI agent via WebRTC, while simultaneously extracting structured data from the conversation to power your backend workflows. Powered by the OpenAI Realtime API, Babelbeez enables low-latency, interruptible speech-to-speech interactions directly in the browser, eliminating the need for phone numbers or SIP infrastructure. Beyond answering customer queries using your automatically generated knowledge base (RAG), the Babelbeez Entity Extraction Engine identifies key data points—such as intents, contact details, or scheduling preferences—and pushes them as clean JSON payloads to your stack via secure HMAC-signed webhooks.Starting Price: $39/month -
32
OmniDimension
OmniDimension
OmniDimension is a Conversational AI platform that helps businesses automate customer conversations across voice, web, and WhatsApp. Users can create AI voice agents for lead generation, appointment booking, customer support, collections, outbound calling, and inbound call handling without coding. The platform includes built-in telephony, AI-powered outbound campaigns, CRM integrations, workflow automation, knowledge base support, multilingual conversations, and real-time analytics. Businesses can connect tools like HubSpot, Salesforce, Google Calendar, Slack, Zapier, Make, n8n, and custom APIs to automate customer interactions and business workflows. OmniDimension enables organizations to deploy AI agents in minutes, scale customer engagement 24/7, and improve response times while reducing operational costs. -
33
Higgs Realtime
Boson AI
Higgs Realtime is a production-quality, real-time speech-to-speech model and API built for natural, continuous conversation. It is an end-to-end, instruction-tuned, audio-native model that can understand audio, text, or both and generate high-quality responses, while also functioning as a text LLM when given text alone. Designed for live voice agents, it follows conversations, handles interruptions, adapts when requests change mid-sentence, and carries multi-step workflows through to completion. The model is trained specifically for voice-agent reflexes such as natural turn-taking, conversational cadence, tone adaptation, spoken tool preambles, multi-turn state tracking, and robust instruction following through changing requests. Semantic turn detection helps distinguish a completed turn from a pause, while multilingual and code-switched understanding supports more than 100 languages without per-language setup.Starting Price: $0.0023 per minute -
34
Voxtral Mini TTS 3.0
Mistral AI
Voxtral Mini TTS 3.0 is Mistral AI's text-to-speech model for developers building voice-enabled applications and services. It generates speech from text in batch and real-time workflows, with preset or cloned voices, emotion and pace controls, and custom pronunciation. The model supports multilingual speech generation and dialect adaptation, making it suitable for conversational audio, localized content, spoken responses, and voice agents. Developers can access speech generation and voice-cloning capabilities through Mistral's API. Voxtral Mini TTS 3.0 is also part of Mistral's Voxtral 3 voice-agent stack, which combines speech recognition, reasoning, tool use, and generated speech; the Voxtral 3 stack can be self-deployed on customer infrastructure.Starting Price: $13/1M chars -
35
Vocode
Vocode
Vocode is an open source library that simplifies the creation of voice-based applications leveraging large language models. Developers can build real-time streaming conversations with LLMs and deploy them to phone calls, Zoom meetings, and more. Vocode provides easy abstractions and integrations so that everything you need is in a single library. It offers out-of-the-box integrations with leading speech-to-text and text-to-speech providers, including AssemblyAI, Deepgram, Google Cloud, Microsoft Azure, and Whisper. The platform supports cross-platform deployment across telephony, web, and Zoom, enabling applications like LLM-powered phone calls, personal assistants, and voice-based games. Vocode's modular design allows for seamless integration of various AI models and services, providing developers with the flexibility to choose the best components for their applications. The platform also supports multilingual capabilities.Starting Price: Free -
36
VaxVoIP
VaxSoft
VaxVoIP SIP Server SDK enables developers to build secure, SIP-based VoIP solutions such as IP-PBX, IVR, auto-dialers, smart agents, call centers, and calling card systems. Fully compatible with the SIP protocol, it supports softphones, hardphones, ATA devices, and other SIP hardware. It includes PBX features like call queues, call forwarding, call recording, voicemail, and call routing. With advanced security features, it protects against SIP floods, scans, and brute-force attacks. The SDK also offers real-time access to audio PCM data, enabling integration of AI, machine learning, and smart agents into VoIP systems for intelligent and enhanced communication. -
37
AgentVoice
AgentVoice
AgentVoice is a platform for building AI‑powered voice agents that can make and answer phone calls and take meaningful actions, like booking meetings, sending texts, and updating CRMs, without requiring a developer. Each call flows through speech recognition to transcribe what’s said, a large language model to determine what to say and do, and an AI‑generated voice to respond naturally. Our agents don’t just respond, they execute tasks during or after the call using real data, memory, and tool access. You can create no‑code workflows that update CRMs, schedule meetings, send follow‑ups, screen leads, handle voicemails, or filter spam calls, all in the same call. Setup is fast, you can create and launch a working agent in less than 30 minutes, using no code: define your agent, choose a voice, connect your tools via 200+ native integrations, low‑code options, or a robust API and webhooks, then upload or generate a script.Starting Price: $50 per month -
38
VaxVoIP WebPhone SDK
VaxSoft
VaxVoIP WebPhone SDK is a software development kit for adding browser-based communications to websites and applications. It combines an HTML/JavaScript webphone with a ServerWebRTC COM component that bridges WebRTC clients to SIP servers and IP-PBX systems, allowing teams to build browser softphones, click-to-call features, customer-portal calling and contact-center applications without replacing their telephony infrastructure. The SDK supports real-time audio and video, text chat and screen sharing in Chrome, Firefox, Safari and Microsoft Edge. Developers can use technical documentation, a 30-day fully functional evaluation, and sample projects for C#, Visual Basic .NET and Visual C++. Commercial licenses cover one service and server with unlimited concurrent calls, and include technical assistance, updates, new releases and maintenance during the license term.Starting Price: $6,240/year -
39
OttrCall
OttrCall
OttrCall is an AI-powered outbound voice calling platform built for modern sales and operations teams. Our natural-sounding voice agents can automate cold calls, follow-ups, appointment reminders, lead qualification, and more — no manual dialing, no burnout. OttrCall helps small to mid-sized businesses streamline outbound workflows across industries like real estate, finance, hospitality, and healthcare. With quick setup, multi-stage pipeline support, and real-time call summaries, OttrCall replaces traditional call centers with always-on, cost-efficient automation. Whether you're nurturing leads or re-engaging dormant customers, OttrCall delivers consistent, scalable conversations — without sounding like a bot. 💡 Highlights: -AI voice agents for outbound calls -No-code setup with full call automation -Human-like speech, not robotic -Ideal for sales, ops, and support teams -Real-time summaries and CRM-ready dataStarting Price: $150/month/1000 minutes -
40
Callswain AI
Betopia Limited
Callswain AI is a SaaS platform for industry-specific AI voice agents that automatically make and answer phone calls. Agents follow written instructions and uploaded knowledge bases to adapt behavior without development. Key Features: • Lead Verifier Agent: Verifies leads and collects missing info via API, Web Forms, or Excel. • Customer Support Agent: Handles Tier-1 support calls and logs searchable issue records. • Receptionist Agent: Answers, routes, and books appointments with configurable time slots. • Hotel Booking Agent: Inquiries, confirmations, reminders, cancellations, and internal room calendars. • Voice & Call Intelligence: Custom voice cloning, call recording, summary, key insights, and full call logs. -
41
Gradium
Gradium
Gradium is a voice AI platform for developers and organizations building speech-enabled applications and conversational agents. Its hosted APIs provide streaming text-to-speech, speech-to-text, speech translation, and speech-to-speech, with WebSocket and REST interfaces, real-time turn detection, pronunciation controls, and voice design or cloning features. A browser-based studio lets users try the models and manage voices, while documentation and SDK guides support application development. Use cases include voice agents, customer-service automation, live transcription, multilingual voice experiences, and spoken content generation. Gradium also publishes Phonon, an open-weight text-to-speech model designed for local, offline use in applications and on-device systems. Plans use credits for speech generation, transcription, and translation.Starting Price: $0/month -
42
Google has released updated Gemini audio models that significantly expand the platform’s capabilities for natural, expressive voice interactions and real-time conversational AI with the introduction of Gemini 2.5 Flash Native Audio and improved text-to-speech technology. The updated native audio model powers live voice agents that can handle complex workflows, follow detailed user instructions more reliably, and maintain smoother multi-turn conversations by better recalling context from previous turns. It is now available across Google AI Studio,Gemini Enterprise Agent Platform, Gemini Live, and Search Live, enabling developers and products to build interactive voice experiences such as intelligent assistants and enterprise voice agents. In addition to the real-time voice improvements, Google enhanced the underlying Text-to-Speech (TTS) models in the Gemini 2.5 family to offer greater expressivity, tone control, pacing adjustments, and multilingual support.
-
43
Kipps.AI
Kipps.AI
Kipps.AI is an enterprise-grade platform for building and deploying AI agents, voice, chat, and WhatsApp that can handle millions of conversations with human-like intelligence and enterprise-scale reliability. It enables organizations to deploy custom agents for lead qualification, booking appointments, customer support, and more, with integrations into CRM systems, telephony platforms, and other business tools. It supports 100 + pre-built integrations such as Salesforce, HubSpot, WhatsApp, Slack, and Zoom; features include detailed analytics (model- and agent-level usage), conversation transcription, real-time call-streaming, sentiment detection, routing to human agents when needed, and enterprise-grade security with SOC 2 Type II, ISO 27001, HIPAA-ready, PCI DSS Level 1, and zero-data-retention options. -
44
Feather
Feather
Feather is an AI-powered voice agent platform that lets businesses create, customize, deploy, and manage intelligent phone call automation that sounds human and handles real tasks at scale, supporting both inbound and outbound calling with context-aware memory, multilingual understanding, seamless warm handoffs to humans, and native telephony essentials like hold music and voicemail detection; its agents can access company knowledge bases for accurate answers, integrate with calendars and CRMs, book appointments, follow up on leads, and automate repetitive communication workflows so teams never miss opportunities and can focus on higher-value work. Built for production-grade reliability and enterprise use, Feather includes observability and quality testing tools to ensure consistent call performance, supports integrations via APIs and webhooks, and can be white-labeled for agencies and software providers while meeting compliance and data-security standards. -
45
Aiello AI Call Agent
Aiello
Aiello AI Call Agent is an AI‑powered voice solution that acts as a smart frontline assistant to transform customer communications. Built on advanced natural language processing and large language models, it engages callers in natural, human‑like conversations across multiple languages—including English, Chinese, Japanese, Bahasa Indonesia, and Korean. With automatic language detection, it ensures that routine inquiries are handled quickly, accurately, and professionally. Beyond answering FAQs, the platform integrates seamlessly with existing telephony and task management systems to transcribe records, automate ticket creation, and escalate complex requests to live agents. Additionally, the AI Call Agent can guide guests through completing, modifying, or cancelling restaurant reservations. This highly scalable, hardware‑free solution can significantly reduce repetitive workloads for your staff while elevating customer interaction and operational efficiency. -
46
Amazon Nova 2 Sonic
Amazon
Nova 2 Sonic is Amazon’s real-time speech-to-speech model designed to deliver natural, flowing voice interactions without relying on separate systems for text and audio. It combines speech recognition, speech generation, and text processing in a single model, enabling smooth, human-like conversations that can shift effortlessly between voice and text. With expanded multilingual support and expressive voice options, it produces responses that sound more lifelike and contextually aware. Its one-million-token context window allows for long, continuous interactions without losing track of prior details. It supports asynchronous task handling, meaning users can continue speaking, change topics, or ask follow-up questions while background tasks, such as searching for information or completing a request, continue uninterrupted. This makes voice experiences feel more fluid and less bound by traditional turn-based dialog constraints. -
47
Vogent
Vogent
Vogent is an all-in-one platform for building humanlike, intelligent, and effective voice agents. It offers a highly authentic, low-latency live voice AI capable of making phone calls up to one hour long and executing follow-up tasks. Vogent automates calls in industries such as healthcare, construction, logistics, and travel. The platform provides a custom end-to-end pipeline for transcription, reasoning, and speech, resulting in extremely low latency and humanlike conversations. Vogent's in-house language models have been trained on millions of phone conversations across hundreds of different task types, performing as well as human agents when prompted or fine-tuned with minimal examples. Developers can dispatch thousands of calls with a few lines of code and automate downstream workflows based on outcomes. The platform supports REST and GraphQL APIs, and offers a no-code dashboard for creating agents, uploading knowledge bases, tracking dials, and exporting transcripts.Starting Price: 9¢ per minute -
48
Workforce Wave
Workforce Wave
Workforce Wave provides AI-powered virtual receptionists and voice agents for small businesses. It answers inbound calls, books appointments, captures lead details, and supports outbound calling campaigns around the clock. The platform helps dental, medical, legal, real estate, restaurant, and home-services teams reduce missed calls and respond faster without adding front-desk workload. -
49
Gemini 3.8 Live
Google
Gemini 3.8 Live is Google DeepMind’s real-time speech-to-speech AI model for building conversational voice applications and interactive agents. The model can maintain natural dialogue while reasoning, using tools, and carrying out tasks during an ongoing conversation. Asynchronous function calling allows applications to execute API and tool requests in the background while Gemini continues streaming audio responses to the user. Gemini 3.8 Live can also incorporate live visual context, enabling agents to respond based on what users say and what the system can see. It supports more than 97 languages, maintains accent consistency, and is designed to accurately interpret alphanumeric information such as confirmation codes, claim numbers, and technical data. Gemini 3.8 Live is available through the Gemini Live API and Google AI Studio for developers building customer service agents, assistants, training applications, and other voice-first experiences. -
50
GPT-Realtime-2.1
OpenAI
GPT-Realtime-2.1 is OpenAI’s reasoning model with tool use for low-latency voice agents and complex speech-to-speech workflows. It updates GPT-Realtime-2 with improved alphanumeric recognition, silence and noise handling, and interruption behavior, helping applications understand spoken code, manage imperfect audio, and respond more naturally when users pause or talk over the agent. Developers can configure reasoning effort to balance deeper thinking against latency and output usage, while strong instruction following helps the model stay aligned with a defined role, tone, and workflow. It accepts and produces both audio and text, can take images as input, and supports function calling so an agent can retrieve information or perform actions during a conversation. The model has a 128,000-token context window, supports up to 32,000 output tokens, and includes reasoning-token support for extended interactions.Starting Price: $0.40 per cached input
