Hi there!
After a fresh install os FreePBX 13.17.0, my phones was not registering in chan_sip extensions. They register only if I change the extension from chan-sip to pjsip.
I get this in the log:
[2019-09-28 07:53:12] WARNING[8327][C-00000022] func_channel.c: Unknown or unavailable item requested: ‘recvip’
[2019-09-28 07:53:12] VERBOSE[8327][C-00000022] pbx.c: Executing [s@from-sip-external:6] Log(“PJSIP/anonymous-00000021”, "WARNING,"Rejecting unknown SIP connection from “”) in new stack
[2019-09-28 07:53:12] WARNING[8327][C-00000022] Ext. s: "Rejecting unknown SIP connection from "
Any help will be great