<br>
<div class="gmail_quote"><br>Hi,  
<div>I&#39;m running a statefull proxy that in most cases need to relay the calls to a PSTN gateway.</div>
<div>After the migration to the Opensips 1.6.1, there is a problem with compatibility / RR module and the gateway (Cisco AS5300).</div>
<div>Opensips does not relay &#39;correctly&#39; (in my case) the ACK messages. The Cisco gateway do not receive ACKs and hangup the call after a timeout.</div>
<div>The configuration script is developed on the sipwise template, but it works perfectly in 1.4 version of Opensips.</div>
<div><br></div>
<div>When debugging I see each time more and more headers in ACK packets</div>
<div>
<div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=4a734ab13a9&gt;</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=4a734ab13a9&gt;</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=4a734ab13a9&gt;</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=4a734ab13a9&gt;</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKa636.94cf333.2</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKa636.94cf333.2</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKa636.94cf333.2</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKa636.94cf333.2</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000023e34b43aea600004e6700001405</div>
<div><br></div>
<div>When disabling the record_route(), and messages go from sip client directly to the gateway - all in ok.</div>
<div>When communicating between 2 sip clients on the same proxy - the messages are relayed correctly.</div>
<div>What can be the solution?</div>
<div><br></div>
<div><br></div>
<div>The entire message log:</div>
<div><br></div>
<div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>INVITE sip:987654@xx.yy.56.226 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026464b446164000023ea000016ed.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 1 INVITE.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 100 Trying.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026464b446164000023ea000016ed.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 1 INVITE.</div>
<div> </div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 407 Proxy Authentication Required.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026464b446164000023ea000016ed.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=c97b4d1cb1f3d0da549e06a8d482ef63.8548.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 1 INVITE.</div>
<div> </div>
<div><br></div>
<div><br></div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>ACK sip:987654@xx.yy.56.226 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026464b446164000023ea000016ed.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=c97b4d1cb1f3d0da549e06a8d482ef63.8548.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 1 ACK.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div>Content-Length: 0.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>INVITE sip:987654@xx.yy.56.226 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 INVITE.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div>Content-Length: 362.</div>
<div>Content-Type: application/sdp.</div>
<div>Supported: replaces,norefersub,timer.</div>
<div>Proxy-Authorization: Digest username=&quot;123456&quot;,realm=&quot;xx.yy.56.226&quot;,nonce=&quot;4b43ec220000000883661dbea2617b91d28401983dd85b7d&quot;,uri=&quot;sip:987654@xx.yy.56.226&quot;,response=&quot;91a62cf62af7870c1e24d6c35857e78d&quot;.</div>

<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 100 Trying.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 INVITE.</div>
<div>Server: OpenSIPS (1.6.1-notls (x86_64/linux)).</div>
<div>Content-Length: 0.</div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 100 Giving a try.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 INVITE.</div>
<div> </div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.25.114:5060</div>
<div>INVITE sip:987654@xx.yy.25.114:5060;transport=udp SIP/2.0.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 INVITE.</div>
<div>Max-Forwards: 69.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 100 Trying.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow-Events: telephone-event.</div>
<div>Content-Length: 0.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 183 Session Progress.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Disposition: session;handling=required.</div>
<div><br><br> </div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 183 Session Progress.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div> </div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div> </div>
<div><br></div>
<div><br></div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>ACK sip:987654@xx.yy.25.114:5060 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616500002441000016f6.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 ACK.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div>Content-Length: 0.</div>
<div>Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Proxy-Authorization: Digest username=&quot;123456&quot;,realm=&quot;xx.yy.56.226&quot;,nonce=&quot;4b43ec220000000883661dbea2617b91d28401983dd85b7d&quot;,uri=&quot;sip:987654@xx.yy.56.226&quot;,response=&quot;91a62cf62af7870c1e24d6c35857e78d&quot;.</div>

<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Type: application/sdp.</div>
<div>Content-Length: 234.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Type: application/sdp.</div>
<div>Content-Length: 234.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>ACK sip:987654@xx.yy.25.114:5060 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616500002441000016f6.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 ACK.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div>Content-Length: 0.</div>
<div>Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Proxy-Authorization: Digest username=&quot;123456&quot;,realm=&quot;xx.yy.56.226&quot;,nonce=&quot;4b43ec220000000883661dbea2617b91d28401983dd85b7d&quot;,uri=&quot;sip:987654@xx.yy.56.226&quot;,response=&quot;91a62cf62af7870c1e24d6c35857e78d&quot;.</div>

<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Type: application/sdp.</div>
<div>Content-Length: 234.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.56.226:5060 -&gt; xx.yy.17.20:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Type: application/sdp.</div>
<div>Content-Length: 234.</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.17.20:5060 -&gt; xx.yy.56.226:5060</div>
<div>ACK sip:987654@xx.yy.25.114:5060 SIP/2.0.</div>
<div>Via: SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616500002441000016f6.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Contact: &lt;sip:123456@xx.yy.17.20&gt;.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>CSeq: 2 ACK.</div>
<div>Max-Forwards: 70.</div>
<div>User-Agent: SJphone/1.65.377a (SJ Labs).</div>
<div>Content-Length: 0.</div>
<div>Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Proxy-Authorization: Digest username=&quot;123456&quot;,realm=&quot;xx.yy.56.226&quot;,nonce=&quot;4b43ec220000000883661dbea2617b91d28401983dd85b7d&quot;,uri=&quot;sip:987654@xx.yy.56.226&quot;,response=&quot;91a62cf62af7870c1e24d6c35857e78d&quot;.</div>

<div><br></div>
<div><br></div>
<div><br></div>
<div>U xx.yy.25.114:5060 -&gt; xx.yy.56.226:5060</div>
<div>SIP/2.0 200 OK.</div>
<div>Via: SIP/2.0/UDP xx.yy.56.226;branch=z9hG4bKf69b.0ced9bb7.0,SIP/2.0/UDP xx.yy.17.20;branch=z9hG4bK591c1114000026474b44616400001647000016f0.</div>
<div>From: &quot;unknown&quot; &lt;sip:123456@xx.yy.56.226&gt;;tag=152937654c2b.</div>
<div>To: &lt;sip:987654@xx.yy.56.226&gt;;tag=708A5698-428.</div>
<div>Date: Wed, 06 Jan 2010 09:59:05 GMT.</div>
<div>Call-ID: D17BF0696DC546A7B436401CD27774720x591c1114.</div>
<div>Server: Cisco-SIPGateway/IOS-12.x.</div>
<div>CSeq: 2 INVITE.</div>
<div>Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE, NOTIFY, INFO.</div>
<div>Allow-Events: telephone-event.</div>
<div>Contact: &lt;sip:987654@xx.yy.25.114:5060&gt;.</div>
<div>Record-Route: &lt;sip:xx.yy.56.226;lr=on;ftag=152937654c2b;did=b39.e643f344&gt;.</div>
<div>Content-Type: application/sdp.</div>
<div>Content-Length: 234.</div>
<div><br></div></div></div></div></div>