GOautodial Open Source Omni-channel Contact Center Suite

Help please. I can't make calls. Where to dig further?
-- Called 8600051@default
-- Executing [8600051@default:1] Konference("Local/8600051@default-00000011;2", "8600051,R") in new stack
-- Local/8600051@default-00000011;1 answered
-- Executing [495774951804129@default:1] AGI in new stack
Manager 'sendcron' logged off from 127.0.0.1
-- AGI Script Executing Application: (EXEC) Options: (Set(_CAMPCUST=42776413))
-- <Local/8600051@default-00000011;1>AGI Script agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing [495774951804129@default:2] Dial("Local/8600051@default-00000011;1", "SIP/04129@PLUSIP,,tTo") in new stack
Using SIP RTP CoS mark 5
-- Called SIP/04129@PLUSIP
> 0x7fbfc4056060 -- Strict RTP learning after remote address set to: 185.54.50.27:62754
-- SIP/PLUSIP-0000000f is making progress passing it to Local/8600051@default-00000011;1
[Oct 18 04:55:47] WARNING[5701][C-00000020]: file.c:774 ast_openstream_full: File confbridge-join does not exist in any format
[Oct 18 04:55:47] WARNING[3928][C-0000000f]: file.c:774 ast_openstream_full: File confbridge-join does not exist in any format
> 0x7fbfc4056060 -- Strict RTP switching to RTP target address 185.54.50.27:62754 as source
> 0x7fbfc4056060 -- Strict RTP learning complete - Locking on source address 185.54.50.27:62754
-- Got SIP response 500 "No routes found in reply from BE" back from 185.54.50.27:5060
-- SIP/PLUSIP-0000000f is circuit-busy
Everyone is busy/congested at this time (1:0/1/0)
-- Executing [495774951804129@default:3] Hangup("Local/8600051@default-00000011;1", "") in new stack
Spawn extension (default, 495774951804129, 3) exited non-zero on 'Local/8600051@default-00000011;1'
-- Executing [h@default:1] AGI") in new stack
-- <Local/8600051@default-00000011;1>AGI Script agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----38-----CONGESTION---------------SIP 500 No routes found in reply from BE) completed, returning 0
[Oct 18 04:55:50] WARNING⁵⁷⁰¹[C-00000020]: func_hangupcause.c:140 hangupcause_read: Unable to find information for channel
-- Executing [h@default:1] AGI") in new stack
-- <Local/8600051@default-00000011;2>AGI Script agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----38--------------------) completed, returning 0
[Oct 18 04:55:50] WARNING³⁹²⁸[C-0000000f]: file.c:774 ast_openstream_full: File confbridge-leave does not exist in any format