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Library supporting the Session Initiation Protocol

The GNU oSIP library is an implementation of SIP (as defined by RFC 3261).

This is the oSIP library (for Omnibus SIP), which consists of a parser and a transaction manager. It gives multimedia and telecom software developers an easy and powerful interface to initiate and control Session Initiation Protocol (SIP) based sessions in their applications. SIP is described in the RFC2543 which is available at http://www.ietf.org/rfc/rfc2543.txt. The oSIP home page includes links to various useful SIP sites. 'oSIP' is little in size and code and thus could be use to implement IP soft-phone as well as embedded SIP software. oSIP is not limited to endpoint agents, and can also be used to implement "SIP proxy". It does not intend to provide a high layer API for controlling "SIP Session" at this step. Instead, it currently provides an API for the SIP message parser, SDP message parser, and library to handle "SIP transactions" as defined by the SIP document.


User manual available in HTML format from http://www.gnu.org/software/osip/doc/osip.html

Heckert gnu.small.png This is a GNU package:osip


Download version 4.1.0 (stable)
released on 6 January 2014

VCS Checkout



LicenseVerified byVerified onNotes
LGPLJanet Casey5 March 2002

Leaders and contributors

Aymeric Moizard Maintainer

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webviewhttp://git.savannah.gnu.org/cgit/osip.git
DeveloperMailing List Info/Archivehttp://lists.gnu.org/archive/html/osip-dev/

Software prerequisites

This entry (in part or in whole) was last reviewed on 9 February 2014.


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The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.