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VoIP
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Gnome-o-Phone
Graphical VoIP software for the Linux Gnome desktop. Includes RtpTunnel utility for tunneling RTP UDP-based traffic through a firewall.
Nautilus Secure Phone
Program that allows two parties to hold a secure voice conversation using Linux and TCP/IP.
NAT H323 under Linux
Mini-HOWTO for NAT and H.323 - configuring Linux to support H.323 while using network address translation.
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).
KPhone
SIP based VoIP user agent. It supports Presence and Instant Messaging.
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.
OpenH323 Gatekeeper
Free H.323 gatekeeper (GPL) based on OpenH323.
Linphone
SIP based web phone. Supported audio codecs are G711, LPC10-15, GSM, and SPEEX.
Minisip
SIP based phone. Supports video, communication encryption and push-to-talk.
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.
OpenH323 Project
The OpenH323 project aims to create a full featured, interoperable, Open Source implementation of the ITU H.323 teleconferencing protocol that can be used by personal developers and commercial users without charge.
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.
isdn2h323
Project homepage for isdn2h323, a Linux-based ISDN to H.323 gateway.
Vovida
VOCAL is an open source project dealing with VoIP. It includes a SIP based Redirect Server, Feature Server, Provisioning Server and Marshal Proxy.
SIPSet
Sip based phone. You can use it as a soft phone, to make and receive calls from your Linux PC.
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