Thanks to open source
Here you may find open source projects are used for Xeepe PBX development.
Xeepe itself IS NOT open source!
Scripting:
Behavior scripting and configuration part of Xeepe PBX is written using wonderful Lua programming language.
Lua is a fast powerful light-weight programming language designed for extending applications.
SIP stack:
Xeepe project uses the best SIP compliant reSIProcate open source library.
reSIProcate provides the most complete and standards compliant implementations of the key IETF RFCs relating to SIP.
The ADAPTIVE Communication Environment (ACE(TM))
ACE is a freely available, open-source object-oriented framework that implements many core patterns for concurrent communication software.
http://www.cs.wustl.edu/~schmidt/ACE.html
SQLite database engine
SQLite is a small public domain C library that implements a self-contained, embeddable, zero-configuration SQL database engine.
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