VOIP -> Free VOIP SDKs

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, Policy Server and Marshal Proxy along with protocol translators from SIP to H.323 and SIP to MGCP. Our hope is that these modules will act as building blocks to help you create better, faster and stronger VoIP systems.

The GNU oSIP Library

oSIP is an implementation of SIP.

SIP stands for the Session Initiation Protocol and is described by the RFC3261. 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 H.323.

JVOIPLIB (Jori's Voice over IP library)

JVOIPLIB is an object-oriented Voice over IP (VoIP) library written in C++.

Bayonne

GNU Bayonne, the telecommunications application server of the GNU project, offers free, scalable, media independent software environment for development and deployment of telephony solutions for use with current and next generation telephone networks.

eXosip

eXosip is a new library based on oSIP. It contains a high layer easier to use for implementing SIP End point.

eXosip is a library that hides the complexity of using the SIP protocol for mutlimedia session establishement. This protocol is mainly to be used by VoIP telephony applications (endpoints or conference server) but might be also usefull for any application that wish to establish sessions like multiplayer games.