Wednesday, 15 February 2012
I have spent a little time reading about sippysoft.com's open source projects: SIP B2BUA and RTPproxy which use GPL and BSD-style licenses respectively. On the surface they look great.
Unlike a SIP proxy "the Back2BackUserAgent maintains complete call state and participates in all call requests". Functions include "accurate call accounting, pre-paid rating and billing, fail over call routing".
RTPproxy can help SIP user agents transverse firewalls, "call recording, playing pre-encoded announcements, real-time stream copying and RTP payload reframing". There is a Java client and an Erlang implementation. It can work together with the major, open SIP proxies like OpenSIPS and Kamailio including their own Sippy B2BUA and another one I've never heard of reSIProcate B2BUA.
Sippy hosts B2BUA and RTPproxy on sourceforge.net, use git and are very recently active. This is impressive because these projects initial code commits look to be from around 8 years ago!
It is good to see more open projects for communications that are going strong. I also like look of their licensed product softphone and switch appliance. I hope to get to load testing each and to comparing notes soon. Asterisk and FreeSWITCH have B2BUA capabilities and for Sippy's B2BUA to be unlike a SIP proxy is interesting. The RTP proxy concept is also new to me.
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