Below is a listing of open source software having to do with Telephony. For a list of VoIP and business telephone providers please visit Voip-Info.org.
Telephony oriented uClinux distribution for Blackfin CPU with integrated Asterisk and support for various analog and ISDN hardware targets.
The Milkfish is an Embedded Communications Software Project. Main objective is to provide a basic NAT traversal solution for cheap hardware enabling a practical setup of multiple SIP phones in a LAN sharing a WAN connection with one public IP address.
CallFilter applies rules to incomming Phone Calls. Much like a network firewall.
A gsm communications library for use with linux based smartphones and other gsm enabled linux based devices. The emphasis is on security, quality, ETSI 07.07 specification coverage and flexible GSM chip support.
xDSL Gateway CPE
xDSL Gateway CPE
OpenSnom aims to implement a Fully Free Firmware for the 150Mhz MIPS (INCA-IP - PSB 21553 E) Based SIP Phone Series (320/360/370) The Phone is based on a Embedded Debian with a lot of additional proprietary Software. Until approvement the project is host
rtusd is a foundation set of real time enabled User Space Devices/Drivers designed to link to HRT high resolution Timer controlled POSIX threads and link re-factored Linux hdw drivers for 2.6.18+. rtusd propogates Linux RT to user space generically.
Create a cell phone working with Android
vpbx VIPER PBX is a VIrtual Performance Enhanced Realtime PBX system integrating Asterisk & Asterisk Realtime API ASTARA with Erlang Softswitch & a VCC Voice Call Continuance server for secure scalable VPBX services for UMA,GSM & SS7 on Linux 2.6.18+.
Complete uClinux distribution for Blackfin CPU with integrated Asterisk and support for several open hardware line interface boards.
onpbx - The embedded asterisk IP-PBX Project. Trying to bring more advanced telephony flows adapted for the Swedish market. This project is based on the switchfin project (http://www.switchfin.org) and will try to be 100% hardware/base-system compati