Related categories 4

Asterisk
Open Source telephony switching and private branch exchange (PBX) daemon. Supported signalling protocols: H.323, SIP, MGCP, SCCP (Cisco Skinny).
Ekiga
Videoconferencing application to make audio and video calls to remote users. Supports both SIP and H.323.
GNU Bayonne
A free, scalable telecommunications application server by the GNU Project.
GNU oSIP
Implementation of Session Initiation Protocol (SIP). This library provides an interface to initiate and control SIP based sessions.
KPhone
SIP based VoIP user agent. It supports Presence and Instant Messaging.
Linphone
SIP based web phone. Supported audio codecs are G711, LPC10-15, GSM, and SPEEX.
OpenH323 Gatekeeper
Free H.323 gatekeeper (GPL) based on OpenH323.
Partysip
SIP proxy server. It can operate as registrar server, redirect server and stateful proxy server. SIP is an open standard (IETF) replacement for H323.
Siproxd Project
Proxy/masquerading daemon for the SIP protocol. It handles registrations of SIP clients on a private IP network and performs rewriting of the SIP message bodies to make SIP connections work via a masquerading firewall (NAT).
Skype
Peer to peer voice service. Users may call landlines and cellphones for a fee; users may call each other for free. Source code is not available.
[Linux Mozilla]
Last update:
March 18, 2015 at 8:45:07 UTC
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