I think there was some issue with my endpoint. After changing endpoints I am getting following error. INVITE request is actually sent 3 times before giving error.
<— Received SIP request (1878 bytes) from UDP:34.215.xxx.xx:5060 —>
INVITE sip:sipML5@34.215.xxx.xx:5060 SIP/2.0
Record-Route: sip:34.215.xxx.xx:5060;ftag=8f4fe7f6-c204-47db-9ef0-32e333b84277;lr=on
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;branch=z9hG4bKc28e.1354185996669af1e04018d4151b77af.0
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;received=54.202.xxx.xx;rport=5060;branch=z9hG4bKPjf4b0eda5-76c4-468d-8dd6-49cfb6873de1
From: “zoiper” sip:zoiper@172.31.xxx.xx;tag=8f4fe7f6-c204-47db-9ef0-32e333b84277
To: sip:sipML5@34.215.xxx.xx
Contact: sip:asterisk@54.202.xxx.xx:5060
Call-ID: 01975931-748a-4d92-9fb4-3aed35844a1e
CSeq: 6667 INVITE
Allow: OPTIONS, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, REGISTER, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 69
User-Agent: Asterisk PBX 15.5.0
Content-Type: application/sdp
Content-Length: 1001
v=0
o=- 2143251701 2143251701 IN IP4 172.31.xxx.xx
s=Asterisk
c=IN IP4 172.31.xxx.xx
t=0 0
m=audio 18492 UDP/TLS/RTP/SAVPF 0 101
a=connection:new
a=setup:actpass
a=fingerprint:SHA-256 82:1F:48:AE:87:31:37:3F:6A:AE:F8:64:B5:B4:7F:3C:3C:AA:D1:5E:BB:7C:F6:04:75:D8:AB:B6:66:08:B1:93
a=ice-ufrag:24d80613151ecd761e446fdd641d9cf4
a=ice-pwd:16e05be64ef34dbf08ce6a173341a3ad
a=candidate:H96bb4088 1 UDP 2130706431 fe80::4e5:f3ff:fe70:33e 18492 typ host
a=candidate:Hac1f144f 1 UDP 2130706431 172.31.xxx.xx 18492 typ host
a=candidate:S36ca91df 1 UDP 1694498815 54.202.xxx.xx 18492 typ srflx raddr 172.31.xxx.xx rport 18492
a=candidate:H96bb4088 2 UDP 2130706430 fe80::4e5:f3ff:fe70:33e 18493 typ host
a=candidate:Hac1f144f 2 UDP 2130706430 172.31.xxx.xx 18493 typ host
a=candidate:S36ca91df 2 UDP 1694498814 54.202.xxx.xx 18493 typ srflx raddr 172.31.xxx.xx rport 18493
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=maxptime:150
a=sendrecv
a=rtcp-mux
<— Transmitting SIP response (631 bytes) to UDP:34.215.xxx.xx:5060 —>
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;rport=5060;received=34.215.xxx.xx;branch=z9hG4bKc28e.1354185996669af1e04018d4151b77af.0
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;rport=5060;received=54.202.xxx.xx;branch=z9hG4bKPjf4b0eda5-76c4-468d-8dd6-49cfb6873de1
Record-Route: sip:34.215.xxx.xx:5060;lr;ftag=8f4fe7f6-c204-47db-9ef0-32e333b84277
Call-ID: 01975931-748a-4d92-9fb4-3aed35844a1e
From: “zoiper” sip:zoiper@172.31.xxx.xx;tag=8f4fe7f6-c204-47db-9ef0-32e333b84277
To: sip:sipML5@34.215.xxx.xx;tag=a19f26c5-bfce-409d-9ee4-88cb7ec605bf
CSeq: 6667 INVITE
Server: Asterisk PBX 15.5.0
Content-Length: 0
<— Received SIP request (392 bytes) from UDP:34.215.xxx.xx:5060 —>
ACK sip:sipML5@34.215.xxx.xx:5060 SIP/2.0
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;branch=z9hG4bKc28e.1354185996669af1e04018d4151b77af.0
From: “zoiper” sip:zoiper@172.31.xxx.xx;tag=8f4fe7f6-c204-47db-9ef0-32e333b84277
To: sip:sipML5@34.215.xxx.xx;tag=a19f26c5-bfce-409d-9ee4-88cb7ec605bf
Call-ID: 01975931-748a-4d92-9fb4-3aed35844a1e
CSeq: 6667 ACK
Max-Forwards: 69
Content-Length: 0
<— Received SIP response (506 bytes) from UDP:34.215.xxx.xx:5060 —>
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;rport=5060;received=54.202.xxx.xx;branch=z9hG4bKPjf4b0eda5-76c4-468d-8dd6-49cfb6873de1
Record-Route: sip:34.215.xxx.xx:5060;lr;ftag=8f4fe7f6-c204-47db-9ef0-32e333b84277
Call-ID: 01975931-748a-4d92-9fb4-3aed35844a1e
From: “zoiper” sip:zoiper@172.31.xxx.xx;tag=8f4fe7f6-c204-47db-9ef0-32e333b84277
To: sip:sipML5@34.215.xxx.xx;tag=a19f26c5-bfce-409d-9ee4-88cb7ec605bf
CSeq: 6667 INVITE
Server: Asterisk PBX 15.5.0
Content-Length: 0
<— Transmitting SIP request (431 bytes) to UDP:34.215.xxx.xx:5060 —>
ACK sip:sipML5@34.215.xxx.xx:5060 SIP/2.0
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;rport;branch=z9hG4bKPjf4b0eda5-76c4-468d-8dd6-49cfb6873de1
From: “zoiper” sip:zoiper@172.31.xxx.xx;tag=8f4fe7f6-c204-47db-9ef0-32e333b84277
To: sip:sipML5@34.215.xxx.xx;tag=a19f26c5-bfce-409d-9ee4-88cb7ec605bf
Call-ID: 01975931-748a-4d92-9fb4-3aed35844a1e
CSeq: 6667 ACK
Max-Forwards: 70
User-Agent: Asterisk PBX 15.5.0
Content-Length: 0
== Everyone is busy/congested at this time (1:0/0/1)
– Auto fallthrough, channel ‘PJSIP/zoiper-00000773’ status is ‘CHANUNAVAIL’
<— Transmitting SIP response (627 bytes) to UDP:34.215.xxx.xx:5060 —>
SIP/2.0 503 Service Unavailable
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;rport=5060;received=34.215.xxx.xx;branch=z9hG4bKf433.7f11e9753bddf58500352f45c72d5c51.0
Via: SIP/2.0/WSS df7jal23ls0d.invalid;rport=33474;received=103.211.39.31;branch=z9hG4bKTG2KDxCq3r2QIsbgrndrncoxRn4AGlOA
Record-Route: sip:34.215.xxx.xx:5060;lr;ftag=LkHCpR6QISZ89MHTlzke
Call-ID: 4c8e2afb-6f38-116c-f6bc-f8127c0cbe91
From: “zoiper” sip:zoiper@34.215.xxx.xx;tag=LkHCpR6QISZ89MHTlzke
To: sip:101@34.215.xxx.xx;tag=5f5b9074-114e-4727-a919-db0df6ec1fe1
CSeq: 3918 INVITE
Server: Asterisk PBX 15.5.0
Reason: Q.850;cause=34
Content-Length: 0
<— Received SIP request (365 bytes) from UDP:34.215.xxx.xx:5060 —>
ACK sip:101@34.215.xxx.xx SIP/2.0
Via: SIP/2.0/UDP 34.215.xxx.xx:5060;branch=z9hG4bKf433.7f11e9753bddf58500352f45c72d5c51.0
From: "zoiper"sip:zoiper@34.215.xxx.xx;tag=LkHCpR6QISZ89MHTlzke
To: sip:101@34.215.xxx.xx;tag=5f5b9074-114e-4727-a919-db0df6ec1fe1
Call-ID: 4c8e2afb-6f38-116c-f6bc-f8127c0cbe91
CSeq: 3918 ACK
Content-Length: 0
Max-Forwards: 69