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About

Open source portable SIP softphone based on PJSIP stack for Windows OS. It allows you to do high quality VoIP calls (person-to-person or on regular telephones) via open SIP protocol. From cloud of SIP providers you can choose the best option for you, register account and use it with MicroSIP. You'll get free person-to-person calls and cheap international calls. Written in C and C++ with minimal system resources usage. User friendly in daily usage. WebRTC echo cancellation algorithm and voice activity detection. Configurable encryption TLS / SRTP for control and media. It has no additional dependencies and stores setting in ini file. Multilanguage and RTL support, localization for Brazilian, Bulgarian, Chinese, Dutch, Estonian, Finnish, French, German, Hebrew, Hungarian, Italian, Korean, Norwegian, Polish, Russian (микросип), Spanish, Swedish, etc. can be used by people with visual impairments using screen reader software such as NVDA.

About

TwinPhone is a pay-as-you-go app for cheap international calls and virtual second phone numbers. Open your browser — or the iPhone app — add credit, and dial any landline or mobile in 145+ countries from $0.02/min. No SIM, no roaming, no app on the other end: you dial ordinary phone numbers and the person you call answers on their normal phone. There is no subscription and no contract. Signing up is free, you pay only for the minutes you use, and the exact rate for the number you dialled is shown before the call connects — no connection fees, no monthly minimum. You can also rent a virtual second number (US and Canada from $3.19/mo) and take calls and SMS in the browser, keeping your personal number private for marketplaces, sign-ups and verification codes. Calls are encrypted in transit (TLS + SRTP) and stay stable on hotel or airport Wi-Fi. Enterprise teams can share one wallet with per-member call logs and CSV export.

Platforms Supported

Windows Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Not Supported
Chromebook Not Supported

Audience

Businesses and companies interested in a portable SIP softphone solution to make high quality VoIP calls

Audience

Expats, migrant workers and international families; frequent travellers and remote workers; and small or distributed teams that call abroad or need a second phone number for sign-ups and verification codes — without a SIM, contract or phone system

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$0.02
Pay as you go
From $0.02/min
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Company Information

MicroSIP
India
www.microsip.org

Company Information

TwinPhone
Founded: 2026
Czech Republic
www.twin-phone.com

Alternatives

Alternatives

mT5

mT5

Google
Mintza

Mintza

Paintingstack Technologies
QuikRing

QuikRing

Syntropy Solutions LLC

Categories

Softphone Supported

Categories

Softphone Features

Audio / Video Conferencing Supported
Call Logging Not Supported
Call Recording Not Supported
Call Transfer Not Supported
Caller Identification Not Supported
Chat / Messaging Supported
Contact Management Not Supported
Fax Management Not Supported

Integrations

HubSpot CRM Not Supported
NerdCRM Supported

Integrations

HubSpot CRM Supported
NerdCRM Not Supported
Claim MicroSIP and update features and information
Claim MicroSIP and update features and information
Claim TwinPhone and update features and information
Claim TwinPhone and update features and information