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The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol (IP).

22 votes
3 answers
10k views

Converting phone to SIP gateway

Is there a way to use my phone as a SIP GSM gateway, so I can make and receive cellular calls using a SIP phone and/or re-route them through a SIP PBX? …
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