Gammu
Gammu is a cellular manager for mobile phones/modems. It contains libraries and functions for ringtones,logos,phonebook,

Communications::Telephony
Office/Business::Scheduling
System::Hardware

Mobile Box
Set of the tools that would be nice to use and to develop for the expirience based on J2ME and Symbian Series 60 like Nokia

Communications::Telephony

bogotel
Bogotel simulates Intel Dialogic hardware for programs using Dialogic APIs. It allows programs that use the System Release

Communications::Telephony

Leif
Leif is a KDE tool for the SonyEricsson T68/T68i/T610 mobile phone. It supports phonebook editing, SMS management and file

Communications::Telephony

pyst: Python for Asterisk
Pyst consists of a set of interfaces and libraries to allow programming of Asterisk from python. The library currently supports

Communications::Telephony
Multimedia::Sound/Audio

reSIProcate
SIP Stack that is RFC 3261 compliant. Project has moved to http://www.resiprocate.org

Communications::Chat
Communications::Conferencing
Communications::Internet Phone
Communications::Telephony
System::Networking

NauPhone
Open source Call Center software, based on H.323/SIP protocols. Contains Nauphone(Software multi-channel IP Phone, with

Communications::Internet Phone
Communications::Telephony

I Hear U
IHU is a VoIP application for Linux (using Qt and Speex), with low latency, crypted stream, minimal use of bandwith, and

Communications::Conferencing
Communications::Internet Phone
Communications::Streaming
Communications::Telephony
Multimedia

Phone Dialup
This program makes it possible to use your old analog modem to dialup, and keep a complete record of all your friends and

Communications::Telephony

wxDialer
wxDialer is a simple program written in wxPython/Python that allows you to make and recieve phone calls on your modem

Communications::Telephony