<div dir="ltr"><div class="gmail_extra"><div class="gmail_extra">Thanks, I appreciate it.</div><div class="gmail_extra"><br></div><div class="gmail_extra">In this setup the there are 2 endpoints (700 and 701) peered up to an Asterisk server (172.16.60.6) via a Kamailio proxy (172.16.60.20).  700 (172.16.60.28) is calling 701 (172.16.3.65).  When 701 answers the OK is sent to the proxy and then to Asterisk.  Asterisk is then ACKing the OK.  The ACK is being sent to the proxy and then the proxy should be sending it back to the endpoint.  It is not.  The ACK is being sent to the proxy and then the proxy is sending to itself again, via the loopback interface.  I believe loose_route() should be re-writing the destination to be the endpoint, but it not.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra">Trace:</div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.28:54936">172.16.60.28:54936</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div>
<div class="gmail_extra">INVITE <a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a> SIP/2.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div>
<div class="gmail_extra">Max-Forwards: 70.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>.</div><div class="gmail_extra">Contact: <sip:sip700_tbs@172.16.60.28:54936;ob>.</div><div class="gmail_extra">
Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">CSeq: 13862 INVITE.</div><div class="gmail_extra">Route: <sip:<a href="http://eng-reg1.example.com">eng-reg1.example.com</a>;transport=udp;lr>.</div>
<div class="gmail_extra">Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS.</div><div class="gmail_extra">Supported: replaces, 100rel, timer, norefersub.</div><div class="gmail_extra">
Session-Expires: 1800.</div><div class="gmail_extra">Min-SE: 90.</div><div class="gmail_extra">User-Agent: CSipSimple_mecha-15/r2272.</div><div class="gmail_extra">Proxy-Authorization: Digest username="sip700_tbs", realm="sip700_tbs", nonce="Uh39eVId/E2Vxz5hgWC/7jMNGAf7rxrV", uri="<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>", response="8a74a8727baa45df84ea1374cb6668f2", cnonce="EYGYpa1zWmEXcOMighUzGZ20cY2HJ7AJ", qop=auth, nc=00000001.</div>
<div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length:   340.</div><div class="gmail_extra">.</div><div class="gmail_extra">v=0.</div><div class="gmail_extra">o=- 3586685645 3586685645 IN IP4 172.16.60.28.</div>
<div class="gmail_extra">s=pjmedia.</div><div class="gmail_extra">c=IN IP4 172.16.60.28.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">m=audio 4004 RTP/AVP 99 0 8 101.</div><div class="gmail_extra">c=IN IP4 172.16.60.28.</div>
<div class="gmail_extra">a=rtcp:4005 IN IP4 172.16.60.28.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra">a=rtpmap:99 SILK/24000.</div><div class="gmail_extra">a=fmtp:99 useinbandfec=0.</div><div class="gmail_extra">
a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-15.</div><div class="gmail_extra"><br></div>
<div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.28:54936">172.16.60.28:54936</a></div><div class="gmail_extra">SIP/2.0 100 trying -- your call is important to us.</div>
<div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">
CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: kamailio (4.0.3 (x86_64/linux)).</div><div class="gmail_extra">Content-Length: 0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra">
<br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.6:5060">172.16.60.6:5060</a></div><div class="gmail_extra">INVITE <a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a> SIP/2.0.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKe51f.d2338795.0.</div><div class="gmail_extra">
Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div><div class="gmail_extra">Max-Forwards: 16.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>.</div><div class="gmail_extra">Contact: <sip:sip700_tbs@172.16.60.28:54936;ob>.</div><div class="gmail_extra">
Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">CSeq: 13862 INVITE.</div><div class="gmail_extra">Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS.</div>
<div class="gmail_extra">Supported: replaces, 100rel, timer, norefersub.</div><div class="gmail_extra">Session-Expires: 1800.</div><div class="gmail_extra">Min-SE: 90.</div><div class="gmail_extra">User-Agent: CSipSimple_mecha-15/r2272.</div>
<div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length:   340.</div><div class="gmail_extra">.</div><div class="gmail_extra">v=0.</div><div class="gmail_extra">o=- 3586685645 3586685645 IN IP4 172.16.60.28.</div>
<div class="gmail_extra">s=pjmedia.</div><div class="gmail_extra">c=IN IP4 172.16.60.28.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">m=audio 4004 RTP/AVP 99 0 8 101.</div><div class="gmail_extra">c=IN IP4 172.16.60.28.</div>
<div class="gmail_extra">a=rtcp:4005 IN IP4 172.16.60.28.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra">a=rtpmap:99 SILK/24000.</div><div class="gmail_extra">a=fmtp:99 useinbandfec=0.</div><div class="gmail_extra">
a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-15.</div><div class="gmail_extra"><br></div>
<div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.6:5060">172.16.60.6:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div><div class="gmail_extra">SIP/2.0 100 Trying.</div>
<div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKe51f.d2338795.0;received=172.16.60.20;rport=5060.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">
CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: Asterisk1.8.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div><div class="gmail_extra">Supported: replaces, timer.</div>
<div class="gmail_extra">Session-Expires: 1800;refresher=uas.</div><div class="gmail_extra">Contact: <<a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Content-Length: 0.</div>
<div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.6:5060">172.16.60.6:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div>
<div class="gmail_extra">INVITE <a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a> SIP/2.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;branch=z9hG4bK0919ead7;rport.</div>
<div class="gmail_extra">Max-Forwards: 70.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">To: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>.</div>
<div class="gmail_extra">Contact: <<a href="http://sip:700@172.16.60.6:5060">sip:700@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">User-Agent: Asterisk1.8.</div><div class="gmail_extra">Date: Wed, 28 Aug 2013 13:34:03 GMT.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div>
<div class="gmail_extra">Supported: replaces, timer.</div><div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length: 263.</div><div class="gmail_extra">.</div><div class="gmail_extra">
v=0.</div><div class="gmail_extra">o=root 1276916964 1276916964 IN IP4 172.16.60.6.</div><div class="gmail_extra">s=Asterisk PBX 1.8.15-cert2.</div><div class="gmail_extra">c=IN IP4 172.16.60.6.</div><div class="gmail_extra">
t=0 0.</div><div class="gmail_extra">m=audio 21930 RTP/AVP 0 8 101.</div><div class="gmail_extra">a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div>
<div class="gmail_extra">a=fmtp:101 0-16.</div><div class="gmail_extra">a=ptime:20.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">
U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.6:5060">172.16.60.6:5060</a></div><div class="gmail_extra">SIP/2.0 100 trying -- your call is important to us.</div><div class="gmail_extra">
Via: SIP/2.0/UDP 172.16.60.6:5060;branch=z9hG4bK0919ead7;rport=5060.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">
To: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">Server: kamailio (4.0.3 (x86_64/linux)).</div><div class="gmail_extra">Content-Length: 0.</div><div class="gmail_extra">.</div><div class="gmail_extra">
<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.3.65:5060">172.16.3.65:5060</a></div><div class="gmail_extra">INVITE <a href="http://sip:sip701_tbs@172.16.3.65:5060">sip:sip701_tbs@172.16.3.65:5060</a> SIP/2.0.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=as5e1a80d8;nat=yes>.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bK9381.d7d662b.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;branch=z9hG4bK0919ead7;rport=5060.</div>
<div class="gmail_extra">Max-Forwards: 16.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">To: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>.</div>
<div class="gmail_extra">Contact: <<a href="http://sip:700@172.16.60.6:5060">sip:700@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">User-Agent: Asterisk1.8.</div><div class="gmail_extra">Date: Wed, 28 Aug 2013 13:34:03 GMT.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div>
<div class="gmail_extra">Supported: replaces, timer.</div><div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length: 263.</div><div class="gmail_extra">.</div><div class="gmail_extra">
v=0.</div><div class="gmail_extra">o=root 1276916964 1276916964 IN IP4 172.16.60.6.</div><div class="gmail_extra">s=Asterisk PBX 1.8.15-cert2.</div><div class="gmail_extra">c=IN IP4 172.16.60.6.</div><div class="gmail_extra">
t=0 0.</div><div class="gmail_extra">m=audio 21930 RTP/AVP 0 8 101.</div><div class="gmail_extra">a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div>
<div class="gmail_extra">a=fmtp:101 0-16.</div><div class="gmail_extra">a=ptime:20.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">
U <a href="http://172.16.3.65:5060">172.16.3.65:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div><div class="gmail_extra">SIP/2.0 180 Ringing.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;received=172.16.60.20;branch=z9hG4bK9381.d7d662b.0.</div>
<div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;rport=5060;branch=z9hG4bK0919ead7.</div><div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes>.</div><div class="gmail_extra">
Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3Asip701_tbs@172.16.60.20">sip:sip701_tbs@172.16.60.20</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div><div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">
Contact: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>.</div><div class="gmail_extra">Allow: PRACK, SUBSCRIBE, NOTIFY, REFER, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, REGISTER, OPTIONS, MESSAGE.</div>
<div class="gmail_extra">Content-Length:  0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.6:5060">172.16.60.6:5060</a></div>
<div class="gmail_extra">SIP/2.0 180 Ringing.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;rport=5060;branch=z9hG4bK0919ead7.</div><div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes>.</div>
<div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3Asip701_tbs@172.16.60.20">sip:sip701_tbs@172.16.60.20</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div><div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">
Contact: <sip:sip701_tbs@172.16.60.20:5060;alias=172.16.3.65~5060~1>.</div><div class="gmail_extra">Allow: PRACK, SUBSCRIBE, NOTIFY, REFER, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, REGISTER, OPTIONS, MESSAGE.</div><div class="gmail_extra">
Content-Length:  0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.6:5060">172.16.60.6:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div>
<div class="gmail_extra">SIP/2.0 180 Ringing.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKe51f.d2338795.0;received=172.16.60.20;rport=5060.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">
CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: Asterisk1.8.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div><div class="gmail_extra">Supported: replaces, timer.</div>
<div class="gmail_extra">Session-Expires: 1800;refresher=uas.</div><div class="gmail_extra">Contact: <<a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Content-Length: 0.</div>
<div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.28:54936">172.16.60.28:54936</a></div>
<div class="gmail_extra">SIP/2.0 180 Ringing.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div><div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div>
<div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div><div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div>
<div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: Asterisk1.8.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div>
<div class="gmail_extra">Supported: replaces, timer.</div><div class="gmail_extra">Session-Expires: 1800;refresher=uas.</div><div class="gmail_extra">Contact: <<a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a>>.</div>
<div class="gmail_extra">Content-Length: 0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.3.65:5060">172.16.3.65:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div>
<div class="gmail_extra">SIP/2.0 200 OK.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;received=172.16.60.20;branch=z9hG4bK9381.d7d662b.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;rport=5060;branch=z9hG4bK0919ead7.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">To: <<a href="mailto:sip%3Asip701_tbs@172.16.60.20">sip:sip701_tbs@172.16.60.20</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div>
<div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">Allow: PRACK, SUBSCRIBE, NOTIFY, REFER, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, REGISTER, OPTIONS, MESSAGE.</div><div class="gmail_extra">Contact: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>.</div>
<div class="gmail_extra">Supported: replaces, 100rel.</div><div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length:   200.</div><div class="gmail_extra">.</div><div class="gmail_extra">
v=0.</div><div class="gmail_extra">o=dresden 3586685646 1 IN IP4 172.16.3.65.</div><div class="gmail_extra">s=sflphone.</div><div class="gmail_extra">c=IN IP4 172.16.3.65.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">
m=audio 41394 RTP/AVP 0.</div><div class="gmail_extra">a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-15.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.6:5060">172.16.60.6:5060</a></div><div class="gmail_extra">
SIP/2.0 200 OK.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;rport=5060;branch=z9hG4bK0919ead7.</div><div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes>.</div><div class="gmail_extra">
Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3Asip701_tbs@172.16.60.20">sip:sip701_tbs@172.16.60.20</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div><div class="gmail_extra">CSeq: 102 INVITE.</div><div class="gmail_extra">
Allow: PRACK, SUBSCRIBE, NOTIFY, REFER, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, REGISTER, OPTIONS, MESSAGE.</div><div class="gmail_extra">Contact: <sip:sip701_tbs@172.16.60.20:5060;alias=172.16.3.65~5060~1>.</div><div class="gmail_extra">
Supported: replaces, 100rel.</div><div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length:   200.</div><div class="gmail_extra">.</div><div class="gmail_extra">v=0.</div><div class="gmail_extra">
o=dresden 3586685646 1 IN IP4 172.16.3.65.</div><div class="gmail_extra">s=sflphone.</div><div class="gmail_extra">c=IN IP4 172.16.3.65.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">m=audio 41394 RTP/AVP 0.</div>
<div class="gmail_extra">a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-15.</div><div class="gmail_extra">
<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">=====</div><div class="gmail_extra">This ACK is never being sent back to the endpoint that answered the call (172.16.3.65):</div><div class="gmail_extra">
=====</div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.6:5060">172.16.60.6:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div><div class="gmail_extra">
ACK sip:sip701_tbs@172.16.60.20:5060;alias=172.16.3.65~5060~1 SIP/2.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;branch=z9hG4bK70890881;rport.</div><div class="gmail_extra">Route: <sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes>.</div>
<div class="gmail_extra">Max-Forwards: 70.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">To: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div>
<div class="gmail_extra">Contact: <<a href="http://sip:700@172.16.60.6:5060">sip:700@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">CSeq: 102 ACK.</div><div class="gmail_extra">User-Agent: Asterisk1.8.</div><div class="gmail_extra">Content-Length: 0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra">
<br></div><div class="gmail_extra">U <a href="http://172.16.60.6:5060">172.16.60.6:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div><div class="gmail_extra">SIP/2.0 200 OK.</div><div class="gmail_extra">
Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKe51f.d2338795.0;received=172.16.60.20;rport=5060.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div>
<div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">
CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: Asterisk1.8.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div><div class="gmail_extra">Supported: replaces, timer.</div>
<div class="gmail_extra">Session-Expires: 1800;refresher=uas.</div><div class="gmail_extra">Contact: <<a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Content-Type: application/sdp.</div>
<div class="gmail_extra">Content-Length: 261.</div><div class="gmail_extra">.</div><div class="gmail_extra">v=0.</div><div class="gmail_extra">o=root 115762304 115762304 IN IP4 172.16.60.6.</div><div class="gmail_extra">s=Asterisk PBX 1.8.15-cert2.</div>
<div class="gmail_extra">c=IN IP4 172.16.60.6.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">m=audio 24198 RTP/AVP 0 8 101.</div><div class="gmail_extra">a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">
a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-16.</div><div class="gmail_extra">a=ptime:20.</div><div class="gmail_extra">a=sendrecv.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.28:54936">172.16.60.28:54936</a></div>
<div class="gmail_extra">SIP/2.0 200 OK.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjBsmwQX-oWu6srxf09JRx98W5IklAwE44.</div><div class="gmail_extra">Record-Route: <sip:172.16.60.20;lr=on;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div>
<div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div><div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div>
<div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">CSeq: 13862 INVITE.</div><div class="gmail_extra">Server: Asterisk1.8.</div><div class="gmail_extra">Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH.</div>
<div class="gmail_extra">Supported: replaces, timer.</div><div class="gmail_extra">Session-Expires: 1800;refresher=uas.</div><div class="gmail_extra">Contact: <<a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a>>.</div>
<div class="gmail_extra">Content-Type: application/sdp.</div><div class="gmail_extra">Content-Length: 261.</div><div class="gmail_extra">.</div><div class="gmail_extra">v=0.</div><div class="gmail_extra">o=root 115762304 115762304 IN IP4 172.16.60.6.</div>
<div class="gmail_extra">s=Asterisk PBX 1.8.15-cert2.</div><div class="gmail_extra">c=IN IP4 172.16.60.6.</div><div class="gmail_extra">t=0 0.</div><div class="gmail_extra">m=audio 24198 RTP/AVP 0 8 101.</div><div class="gmail_extra">
a=rtpmap:0 PCMU/8000.</div><div class="gmail_extra">a=rtpmap:8 PCMA/8000.</div><div class="gmail_extra">a=rtpmap:101 telephone-event/8000.</div><div class="gmail_extra">a=fmtp:101 0-16.</div><div class="gmail_extra">a=ptime:20.</div>
<div class="gmail_extra">a=sendrecv.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">=====</div><div class="gmail_extra">This is the ACK that shows up on the loopback interface (I believe it should be going to 172.16.3.65):</div>
<div class="gmail_extra">=====</div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div>
<div class="gmail_extra">ACK sip:172.16.60.20;lr;ftag=as5e1a80d8;nat=yes SIP/2.0.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKcydzigwkX.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.6:5060;branch=z9hG4bK70890881;rport=5060.</div>
<div class="gmail_extra">Max-Forwards: 16.</div><div class="gmail_extra">From: "Alpha" <<a href="mailto:sip%3A700@172.16.60.6">sip:700@172.16.60.6</a>>;tag=as5e1a80d8.</div><div class="gmail_extra">To: <<a href="http://sip:sip701_tbs@172.16.60.20:5060">sip:sip701_tbs@172.16.60.20:5060</a>>;tag=64c37e7e-19b8-46ae-ad0d-f2a4abe667bc.</div>
<div class="gmail_extra">Contact: <<a href="http://sip:700@172.16.60.6:5060">sip:700@172.16.60.6:5060</a>>.</div><div class="gmail_extra">Call-ID: <a href="http://64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060">64a513d30fc6a51e54e8255b7169345c@172.16.60.6:5060</a>.</div>
<div class="gmail_extra">CSeq: 102 ACK.</div><div class="gmail_extra">User-Agent: Asterisk1.8.</div><div class="gmail_extra">Content-Length: 0.</div><div class="gmail_extra">.</div><div class="gmail_extra"><br></div><div class="gmail_extra">
<br></div><div class="gmail_extra">U <a href="http://172.16.60.28:54936">172.16.60.28:54936</a> -> <a href="http://172.16.60.20:5060">172.16.60.20:5060</a></div><div class="gmail_extra">ACK <a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a> SIP/2.0.</div>
<div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport;branch=z9hG4bKPjK4X6qtfWQUXsbgPP8D6j-bxR0KBd7r-x.</div><div class="gmail_extra">Max-Forwards: 70.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div>
<div class="gmail_extra">To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">
CSeq: 13862 ACK.</div><div class="gmail_extra">Route: <sip:172.16.60.20;lr;ftag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P;nat=yes>.</div><div class="gmail_extra">Content-Length:  0.</div><div class="gmail_extra">.</div><div class="gmail_extra">
<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">U <a href="http://172.16.60.20:5060">172.16.60.20:5060</a> -> <a href="http://172.16.60.6:5060">172.16.60.6:5060</a></div><div class="gmail_extra">ACK <a href="http://sip:701@172.16.60.6:5060">sip:701@172.16.60.6:5060</a> SIP/2.0.</div>
<div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.20;branch=z9hG4bKcydzigwkX.</div><div class="gmail_extra">Via: SIP/2.0/UDP 172.16.60.28:54936;rport=54936;branch=z9hG4bKPjK4X6qtfWQUXsbgPP8D6j-bxR0KBd7r-x.</div><div class="gmail_extra">
Max-Forwards: 16.</div><div class="gmail_extra">From: <<a href="mailto:sip%3Asip700_tbs@eng-reg1.example.com">sip:sip700_tbs@eng-reg1.example.com</a>>;tag=bmiDmchqpEnJnCFuHdLZNICQ-DisG41P.</div><div class="gmail_extra">
To: <<a href="mailto:sip%3A701@eng-reg1.example.com">sip:701@eng-reg1.example.com</a>>;tag=as7e09c7c3.</div><div class="gmail_extra">Call-ID: BUDvyYQczBQPRIOhj7t7FodP7675QPGi.</div><div class="gmail_extra">CSeq: 13862 ACK.</div>
<div class="gmail_extra">Content-Length:  0.</div><div class="gmail_extra">.</div><div><br></div>
</div></div>