Internal Program Version: Chan_SCCP  4.3
  
Chan_SCCP-b is a replacement Channel Driver for chan_skinny in the 
Asterisk Channel Driver Library. It delivers better performance, 
scalability, interoperability and functionality than either chan_skinny 
or chan_sip on a SCCP/Skinny capable phone.

The Skinny Client Control Protocol (SCCP/Skinny) is a proprietary network 
terminal control protocol originally developed by Selsius Corporation 
(Taken over by Cisco). The term "Skinny" reflects that SCCP is a simple 
and uncomplicated ("lightweight") protocol requiring relatively little 
computer processing. 

http://chan-sccp-b.sourceforge.net