[Freeswitch-dev] Connect to SIP Trunking

[Roamer Roamer]

Hi all, I'm new to freeswitch and want to learn SIP development, I have a
question: what's protocol is using for the SIP PBX(freeswitch, asterisk,
sipx) connect to SIP Trunking?  In freeswitch source code, which part
source code is for connect to SIP trunking ?

Thank you in advance.
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