it would take lot if time to develop all the stacks mentioned below either we can consider existing open source stacks or 3rd party commercial options like aricent , ccpu or netbricks which could help in faster roll out
some parts are patented(audio and video codecs) and can never be made open source such parts we have to think on how to get the tie up
SS7 : MTP1/2/3 , ISUP , TCAP, MAP , INAP , CAMEL
sigtran : M2UA , M3UA
ISDN : euro ISDN
3G-H324M : compliant to existing 3gpp protocols
Driver : channel driver to integrate various open source call manager , HDLC
Audio Codecs : G711 , echo cancellation , DTMF , G729 , G723
Video Codecs : H264 , H263
we are mentioning all the areas of effort , later it will be easy to distribute between interested contributors
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