Free VoIP Software Development Libraries

These VoIP Software Development Libraries
are being used for the development of VoIP software. Here is the list of VoIP
Software Libraries:
Vovida Open Communication Application Library (VOCAL)
The Vovida Open Communication Application Library (VOCAL) is an open source project targeted at facilitating the adoption of VoIP in the marketplace. VOCAL provides the development community with software and tools needed to build new and exciting VoIP features, applications and services. The software in VOCAL includes a SIP based Redirect Server, Feature Server, Provisioning Server and Marshal Proxy. This is the stable development branch of the VOCAL.
The GNU oSIP Library
oSIP is an implementation of SIP.
SIP stands for the Session Initiation Protocol and is described by the rfc3261 (wich deprecates rfc2543). This library aims to provide multimedia and telecom software developers an easy and powerful interface to initiate and control SIP based sessions in their applications. SIP is a open standard replacement from IETF for H323.
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Related Software
- eXosip,
GPL. This
is a new library based on oSIP. It contains a high layer easier to use for
implementing SIP End point.
- Partysip, GPL. This is a SIP proxy
server developed initiated by WellX Telecom & me. I now maintain this
software through my own company: antisip.
It is a plugin oriented program with registration, authentication and
routing capabilities.
- linphone, GPL. linphone is a SIP
webphone with support for several different codecs including speex.
Both eXosip and partysip has been tested at several SIPit and compliance with
most vendors has been verified.
oSIP capabilities
The GNU oSIP library is written in C and get no dependencies except the
standard C library. oSIP is thread safe and will generally be used in a
multi-threaded application. Nevertheless, this is optional.
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".
oSIP 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.

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