<div dir="ltr">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 ?<div>
<br></div><div>Thank you in advance.</div></div>