oSIP

OSIP

Original author(s)	Aymeric Moizard
Stable release	4.1.0 / December 18, 2013 (2013-12-18)
Development status	stable
Written in	C
Operating system	Cross-platform
Platform	GNU/Linux, FreeBSD, Windows, Mac OS, iPhone, Android, BlackBerry OS
Type	Voice over IP, instant messaging, videoconferencing
License	GNU LGPL version 2
Website	www.osip.org

oSIP is a free software VoIP library implementing lower layers of Session Initiation Protocol (SIP) published as rfc3261. The library includes minimal codebase required by any SIP application and offer enough flexibility to implement any SIP extension or behavior. Started in September 2000 and published in April 2001, oSIP is among the oldest SIP open source stack still being developed and maintained. The project was made part of the GNU Project as GNU oSIP in 2002.

Software using oSIP

• eXosip. It stands for the "eXtented osip" library. An extension of oSIP for softphone implementation. (Author: Aymeric Moizard).
• GNU SIP Witch. (Author: GNU Project).

Software that used oSIP

• Linphone. Linphone has been the first project based on oSIP and eXosip.
• SFLphone.
• FreeSWITCH.

Citations from Books

• "We present results of experiments performed on oSIP, an open-source implementation of the Session Initiation Protocol embedded in many IP Phones."

• "We applied our tool to a large software application: oSIP, an open-source implementation of the Session Initiation Protocol."

• "The development of m-learning server and user entity will be based on oSIP, eXosip and oRTP, which are open source SIP software."

• "In the second function, they are: the execution of the scripts to switch on/off the wireless interface; the creation and initialization of a new eXosip stack (the C-based SIP stack used by UCT IMS client); and the invocation of a new register phase."

• "The implementation of the client is achieved by the use of several free open-source libraries: the oSIP and eXosip libraries for SIP signalling;..."

• "We have implemented a simple IMS client using eXtended osip (eXosip) library in C programming."

• "There have been many mature open source SIP stack at present, such as Osip/Exosip, OPAL, VOCAL, etc. Among these SIP stacks, Osip/Exosip, which is small and fast, is most suitable for portable applications."

See also

• List of SIP software

References

• GNU oSIP Library Brave Gnu World Linux Magazine 2002 Issue 22, page 97.
• The Essential Guide to Open-Source VoIP VoIP News Mar 12, 2008
• Principios de VoIP (in Portuguese) (brief mention), Linux Magazine Brazil #3, pages 25 & 26