Pl find the CLI output while this window was popped:
[Jun 6 02:57:08] NOTICE[2951]: chan_sip.c:13470 handle_response_invite: Failed to authenticate on INVITE to '"M6060257070000011987" <sip:0000000000@192.168.1.2>;tag=as04314f89'
[Jun 6 02:57:08] -- SIP/58.68.65.41-00000020 is circuit-busy
[Jun 6 02:57:08] == Everyone is busy/congested at this time (1:0/1/0)
[Jun 6 02:57:08] -- Executing [919055976442@default:3] Hangup("Local/8600051@default-4a14,1", "") in new stack
[Jun 6 02:57:08] == Spawn extension (default, 919055976442, 3) exited non-zero on 'Local/8600051@default-4a14,1'
[Jun 6 02:57:08] -- Executing [h@default:1] DeadAGI("Local/8600051@default-4a14,1", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----21-----CONGESTION----------") in new stack
[Jun 6 02:57:08] -- AGI Script
agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
[Jun 6 02:57:08] == Manager 'sendcron' logged off from 127.0.0.1
[Jun 6 02:57:08] == Spawn extension (default, 8600051, 1) exited non-zero on 'Local/8600051@default-4a14,2'
[Jun 6 02:57:08] -- Executing [h@default:1] DeadAGI("Local/8600051@default-4a14,2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----0---------------") in new stack
[Jun 6 02:57:08] -- AGI Script
agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
[Jun 6 02:57:09] == Manager 'sendcron' logged off from 127.0.0.1
[Jun 6 02:57:10] == Manager 'sendcron' logged off from 127.0.0.1