[SR-Users] Possible causes of calls being terminated (ACK packet never received)

Alex Villací­s Lasso a_villacis at palosanto.com
Wed May 21 01:37:08 CEST 2014 

I am trying to diagnose a SIP issue between our carrier and our network. The carrier has a CARRIER_IP and a different CARRIER_MEDIA_IP, and it submits an INVITE packet to MY_PUBLIC_IP using MY_DID. The firewall at our public IP (where the attached traffic 
sample was taken) redirects it to a particular Kamailio server at 192.168.10.10 inside the LAN, and it in turn routes it to the Asterisk instance in localhost. The issue is that the INVITE is received, then the SIP/2.0 100 Trying and then SIP/2.0 200 OK 
are routed back (or so I think), and then the expected ACK from is never received, even though the caller already hears the media from the Asterisk IVR. After a timeout, our Asterisk closes the call, in the middle of the conversation.

I am trying to explain the situation to our carrier, but I want to rule out possible misconfigurations on our side. Are there common misconfigurations that produce the symptoms described here? Are there any issues evident from the attached traffic?
-------------- next part --------------
10:55:02.721271 IP CARRIER_IP.5060 > MY_PUBLIC_IP.5060: SIP, length: 870
E....H at .....&~.).........n..INVITE sip:MY_DID at MY_PUBLIC_IP:5060 SIP/2.0
Max-Forwards: 69
Session-Expires: 3600;Refresher=uac
Supported: timer
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP>;tag=3609590102-643763
P-Asserted-Identity:"WIRELESS CALLER"<sip:CALLER_ID at CALLER_SOURCE_IP:5060>
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Via: SIP/2.0/UDP CARRIER_IP:5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Contact: sip:CALLER_ID at CARRIER_IP:5060
Content-Type: application/sdp
Content-Length: 303

v=0
o=carrierhostname 1234 0 IN IP4 CARRIER_MEDIA_IP
s=sip call
c=IN IP4 CARRIER_MEDIA_IP
t=0 0
m=audio 27630 RTP/AVP 18 0 8 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=maxptime:20

10:55:02.749669 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 396
E....]..?.......&~.)........SIP/2.0 100 trying -- your call is important to us
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Via: SIP/2.0/UDP CARRIER_IP:5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e;rport=5060
Server: kamailio (4.1.3 (x86_64/linux))
Content-Length: 0


10:55:03.757740 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1171
E....^..?.......&~.)........SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080;alias=127.0.0.1~5080~1>
Content-Type: application/sdp
Require: timer
Content-Length: 281

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 17780 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=nortpproxy:yes

10:55:04.257451 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1171
E...._..?.......&~.)........SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080;alias=127.0.0.1~5080~1>
Content-Type: application/sdp
Require: timer
Content-Length: 281

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 17780 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=nortpproxy:yes

10:55:05.258278 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1171
E....`..?.......&~.)........SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080;alias=127.0.0.1~5080~1>
Content-Type: application/sdp
Require: timer
Content-Length: 281

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 17780 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=nortpproxy:yes

10:55:07.257412 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1171
E....a..?.......&~.)........SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080;alias=127.0.0.1~5080~1>
Content-Type: application/sdp
Require: timer
Content-Length: 281

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 17780 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=nortpproxy:yes

10:55:11.256775 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....b..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:15.257233 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....c..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:19.256776 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....d..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:23.256988 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....e..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:27.256731 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....f..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:31.257445 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....g..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:35.258120 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 1125
E....h..?.......&~.).....m..SIP/2.0 200 OK
Via: SIP/2.0/UDP CARRIER_IP:5060;rport=5060;branch=b18bbcc394bb5dae43946b12f5d5fe0e
Record-Route: <sip:127.0.0.1;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
Record-Route: <sip:192.168.10.10;r2=on;lr=on;ftag=3609590102-643763;vsf=AAAAAGhZVlxTUnJZUllGSQAAAAAAAAAAAAAAAAAAOjEzNTI-;nat=yes>
From: "WIRELESS CALLER" <sip:ChanceBackup at CARRIER_IP>;tag=3609590102-643763
To: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 1 INVITE
Server: Asterisk PBX 11.8.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
Session-Expires: 1800;refresher=uac
Contact: <sip:MY_DID at MY_PUBLIC_IP:5080>
Content-Type: application/sdp
Require: timer
Content-Length: 263

v=0
o=root 607970891 607970891 IN IP4 MY_PUBLIC_IP
s=Asterisk PBX 11.8.1
c=IN IP4 MY_PUBLIC_IP
t=0 0
m=audio 11928 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

10:55:35.762848 IP MY_PUBLIC_IP.5060 > CARRIER_IP.5060: SIP, length: 590
E..j.i..?.......&~.).....V..BYE sip:CALLER_ID at CARRIER_IP:5060 SIP/2.0
Via: SIP/2.0/UDP MY_PUBLIC_IP:5060;branch=z9hG4bK011d.414379b7804d2a478e97a7ac1b6a4b56.0
Via: SIP/2.0/UDP MY_PUBLIC_IP:5080;received=127.0.0.1;branch=z9hG4bK4c2474b3;rport=5080
Max-Forwards: 69
From: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
To: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 102 BYE
User-Agent: Asterisk PBX 11.8.1
X-Asterisk-HangupCause: No user responding
X-Asterisk-HangupCauseCode: 18
Content-Length: 0


10:55:35.852338 IP CARRIER_IP.5060 > MY_PUBLIC_IP.5060: SIP, length: 430
E....I at .....&~.)............SIP/2.0 200 OK
Via: SIP/2.0/UDP MY_PUBLIC_IP:5060;branch=z9hG4bK011d.414379b7804d2a478e97a7ac1b6a4b56.0
Via: SIP/2.0/UDP MY_PUBLIC_IP:5080;received=127.0.0.1;branch=z9hG4bK4c2474b3;rport=5080
From: "unknown" <sip:MY_DID at MY_PUBLIC_IP:5060>;tag=as0d5ffe67
To: "WIRELESS CALLER" <sip:CALLER_ID at CARRIER_IP:5060>;tag=3609590102-643763
Call-ID: 90553-3609590102-643720 at msw1
CSeq: 102 BYE
Content-Length: 0

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