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I have a project to develop simple VOIP gateway using PJSIP to bridge voice from SIP phone client to GSM modem, below the requirement and flow
1 . Standard SIP protocol,
2 . Support SIP TLS
3 . G711/G729 speech coding/decoding
4 . acoustic echo and noise cancellation
5 . Deliver the source code and installation apps
7. preferably using PJSIP (small footprint)
SIP CLIENT PHONE <---- (ETHERNET or WLAN)-----> TARGET <-- (AT command + AUDIO IN/OUT)> GSM module
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