The telephony packages feed
Flutter plugin for telephony features like query device sms directory, listen for incoming messages, retrieve various network parameters, etc.
Odoo modules for telephony integration
Open Source Telephony Application Prototyping Framework
A Ruby framework for building telephony applications
Android Telephony SDK bridge with some additional features
IVOZ Provider - Multitenant solution for VoIP telephony providers
Yet Another Telephony Engine (http://yate.ro)
Telephony driver for Broadcom 6358 running OpenWrt
Open source peer-to-peer Internet telephony (P2P-SIP) software in Python
SpanDSP is a low-level signal processing library that modulates and demodulates signals commonly used in telephony, such as the "noise" generated by a fax modem or DTMF touchpad.