-> service asterisk restart
-> asterisk -rvvvvv
connect 6005.
--> registered SIP  '6005' at serverip:someport
---> DTLS ECDH initialized (secp256r1), faster PFS enabled
---> using SIP RTP CoS mark 5

-->registered SIP '6006' at serverip:someport
---> DTLS ECDH initialized (secp256r1), faster PFS enabled
---> using SIP RTP CoS mark 5

---> Executing [6006@outgoing:1] Dial("SIP/6005-00000002","SIP/6006") in new stack
---> DTLS ECDH initialized (secp256r1), faster PFS enabled
---> using SIP RTP CoS mark 5
---> [Dec 21 12:06:26] ERROR[8394][C-00000001]: netosck2.c:305 ast_sockaddr_resolve:getaddrinfo("df7jal231s0d.invalid","(null)", ...): Name of service not known
--->[Dec 21 12:06:26] ERROR[8394][C-00000001]: chan_sip.c:16610 __set_address_from_contact: Invalid host name in Contact: (can't resolve in DNS) : 'df7ja123ls0d.invalid'
---> Called SIP/6006
---> SIP/6006-00000003 is ringing
---> Got SIP response 603 "failed to get local SDP" back from 192.168.1.120:58863
--->SIP/6006-00000003 is busy

--->Everyone is busy/congested at this time(1:1/0/0)
--->Executing [6006@outgoing:2] Hangup("SIP/6005-000000002","") in new stack
--->Spawn extension(outgoing,6006,2) exited non-zero on 'SIP/6005-0000002')
----->WebSocket connection from '192.168.1.120:58861' forcefully closed due to fatal write error
----->WebSocket connection from '192.168.1.120:57433' forcefully closed due to fatal write error