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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple style='word-wrap: break-word;-webkit-nbsp-mode: space;-webkit-line-break: after-white-space'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Adrian,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’d like to clarify that this a valid Session-match ACM model scenario wherein both the UAs are behind NATs, i.e.:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>'a=setup:active' is received in OFFER from Blink-1 <o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>i.e. in the advanced properties of SIP account of Blink-1, MSRP section, connection model is set to acm.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>'a=setup:actpass' is sent in OFFER to Blink-2 by the SBC<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>'a=setup:active' is received from Blink-2 in ANSWER <o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>i.e. in the advanced properties of SIP account of Blink-2, MSRP section, connection model is set to acm.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>'a=setup:passive' is sent in ANSWER to Blink-1 by the SBC.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>TCP stitching is triggered in the SBC media plane when both the Blinks initiate SYNs towards each other via the SBC for MSRP streams.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I hope this helps clear up things.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Gaurav</span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> blink-bounces@lists.ag-projects.com [mailto:blink-bounces@lists.ag-projects.com] <b>On Behalf Of </b>Adrian Georgescu<br><b>Sent:</b> Saturday, March 26, 2011 2:45 AM<br><b>To:</b> Blink Support Forum<br><b>Subject:</b> Re: [Blink] Chat stream failed: MSRPBindSessionTimeout<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>We do not have time and resources to address interoperability issues with Session Border Controllers. The Session-match ACM model is broken by design and we do not support it.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>You should ask the SBC manufacturers for supporting and developing this broken connection model.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Adrian<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>On Mar 25, 2011, at 9:32 PM, Gaurav Nangla wrote:<o:p></o:p></p></div><p class=MsoNormal><br><br><o:p></o:p></p><div><p style='margin-bottom:12.0pt'><span style='font-size:10.0pt'>Hello,<br><br>We tried setting up a MSRP chat session between two blinks(let's call them Blink-1, Blink-2) with a SBC lying in the signalling and media paths.<br>As far as signalling plane(SBC-SP) is concerned the SBC sbove is in a strict B2BUA mode. In the media plane(SBC-MP) it's acting strictly as a relay (i.e. NAT-PT mode).<br><br>Now, the scenario we've setup is a special one.<br>It's a [RFC6135] MSRP Alternative Connection Model (ACM) scenario wherein we've ensured that OFFER and ANSWER both contain 'a=setup:active' attribute.<br>What this means is that the SBC will be receiving SYNs from both the Blinks and handling them using the 'TCP splicing' technique.<br>It's basically making both the UAs think that they've each initiated and setup a MSRP TCP connection.<br><br>The partial call flow below should clear up things a little more:<br><br>| 10.201.1.152(Blink-1) | 10.201.1.99(Blink-2) |<br>| |10.204.1.28(SBC-SP)| |10.207.1.100(SBC-MP)<br>| Request: INVITE sip | | |SIP/SDP: Request: INVITE <a href="sip:12345@10.204.1.28">sip:12345@10.204.1.28</a>, with session description<br>|(5060)------------->(5060) | | |<br>| Status: 100 Trying | | |SIP: Status: 100 Trying<br>|(5060)<-------------(5060) | | |<br>| | Request: INVITE sip | |SIP/SDP: Request: INVITE <a href="sip:12345@10.201.1.99">sip:12345@10.201.1.99</a>, with session description<br>| |(5060)------------->(5060) | |<br>| | Status: 100 Trying | |SIP: Status: 100 Trying<br>| |(5060)<-------------(5060) | |<br>| | Status: 180 Ringing | |SIP: Status: 180 Ringing<br>| |(5060)<-------------(5060) | |<br>| Status: 180 Ringing | | |SIP: Status: 180 Ringing<br>|(5060)<-------------(5060) | | |<br>| | Status: 200 OK | |SIP/SDP: Status: 200 OK, with session description<br>| |(5060)<-------------(5060) | |<br>| Status: 200 OK | | |SIP/SDP: Status: 200 OK, with session description<br>|(5060)<-------------(5060) | | |<br>| Request: ACK sip | | |SIP: Request: ACK <a href="sip:12345@10.204.1.28:5060">sip:12345@10.204.1.28:5060</a><br>|(5060)------------->(5060) | | |<br>| | Request: ACK sip | |SIP: Request: ACK <a href="sip:12345@10.201.1.99">sip:12345@10.201.1.99</a><br>| |(5060)------------->(5060) | |<br>| 53502 > 15002 [SYN] | | |TCP: 53502 > 15002 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=3 TSV=856688003 TSER=0<br>|(53502)---------------------------------------------------->(15002) |<br>| | | 49838 > 15000 [SYN] |TCP: 49838 > 15000 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=3 TSV=971262787 TSER=0<br>| | |(49838)------------>(15000) |<br>| 15002 > 53502 [SYN, ACK] | | |TCP: 15002 > 53502 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=3 TSV=856688003 TSER=0<br>|(53502)<----------------------------------------------------(15002) |<br>| | | 15000 > 49838 [SYN, ACK] |TCP: 15000 > 49838 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=3 TSV=971262787 TSER=0<br>| | |(49838)<------------(15000) |<br>| | | 49838 > 15000 [ACK] |TCP: 49838 > 15000 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=971262787 TSER=971262787<br>| | |(49838)------------>(15000) |<br>| [TCP Dup ACK] | | |TCP: [TCP Dup ACK 921#1] 15002 > 53502 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=971262787 TSER=971262787<br>|(53502)<----------------------------------------------------(15002) |<br>| 53502 > 15002 [ACK] | | |TCP: 53502 > 15002 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=856688003 TSER=856688003<br>|(53502)---------------------------------------------------->(15002) |<br>| | | [TCP Dup ACK] |TCP: [TCP Dup ACK 922#1] 15000 > 49838 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=856688003 TSER=856688003<br>| | |(49838)<------------(15000) |<br>| Request: SEND Trans | | |MSRP: Request: SEND Transaction ID: 745f0cb1fb640e52<br>|(53502)---------------------------------------------------->(15002) |<br>| | | Request: SEND Trans |MSRP: Request: SEND Transaction ID: 745f0cb1fb640e52<br>| | |(49838)<------------(15000) |<br>| | | [TCP Dup ACK] |TCP: [TCP Dup ACK 923#1] 49838 > 15000 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=971262787 TSER=971262787<br>| | |(49838)------------>(15000) |<br>| [TCP Dup ACK 921#2] | | |TCP: [TCP Dup ACK 921#2] 15002 > 53502 [ACK] Seq=1 Ack=1 Win=524280 Len=0 TSV=971262787 TSER=971262787<br>|(53502)<----------------------------------------------------(15002) |<br>| | | Request: SEND Trans |MSRP: Request: SEND Transaction ID: 6ed1199a610a6a7d<br>| | |(49838)------------>(15000) |<br>| Request: SEND Trans | | |MSRP: Request: SEND Transaction ID: 6ed1199a610a6a7d<br>|(53502)<----------------------------------------------------(15002) |<br>| 53502 > 15002 [ACK] | | |TCP: 53502 > 15002 [ACK] Seq=227 Ack=226 Win=524280 Len=0 TSV=856688003 TSER=971262787<br>|(53502)---------------------------------------------------->(15002) |<br>| | | 15000 > 49838 [ACK] |TCP: 15000 > 49838 [ACK] Seq=227 Ack=226 Win=524280 Len=0 TSV=856688003 TSER=971262787<br>| | |(49838)<------------(15000) |<br>| | | [TCP Retransmission |MSRP: [TCP Retransmission] Request: SEND Transaction ID: 6ed1199a610a6a7d<br>| | |(49838)------------>(15000) |<br>| [TCP Retransmission | | |MSRP: [TCP Retransmission] Request: SEND Transaction ID: 6ed1199a610a6a7d<br>|(53502)<----------------------------------------------------(15002) |<br>| [TCP Dup ACK] | | |TCP: [TCP Dup ACK 935#1] 53502 > 15002 [ACK] Seq=227 Ack=226 Win=524280 Len=0 TSV=856688012 TSER=971262796<br>|(53502)---------------------------------------------------->(15002) |<br>| | | [TCP Dup ACK] |TCP: [TCP Dup ACK 936#1] 15000 > 49838 [ACK] Seq=227 Ack=226 Win=524280 Len=0 TSV=856688012 TSER=971262796<br>| | |(49838)<------------(15000) |<br>| [TCP Retransmission | | |MSRP: [TCP Retransmission] Request: SEND Transaction ID: 745f0cb1fb640e52<br>|(53502)---------------------------------------------------->(15002) |<br>| | | [TCP Retransmission |MSRP: [TCP Retransmission] Request: SEND Transaction ID: 745f0cb1fb640e52<br>| | |(49838)<------------(15000) |<br>| | | [TCP Dup ACK |TCP: [TCP Dup ACK 1027#1] 49838 > 15000 [ACK] Seq=226 Ack=1 Win=524280 Len=0 TSV=971262806 TSER=971262787<br>| | |(49838)------------>(15000) |<br>| [TCP Dup ACK | | |TCP: [TCP Dup ACK 1028#1] 15002 > 53502 [ACK] Seq=226 Ack=1 Win=524280 Len=0 TSV=971262806 TSER=971262787<br>|(53502)<----------------------------------------------------(15002) |<br><br><br>Now with reference to the above, I've got a few questions:<br>1. The 'SEND Transaction 745f0cb1fb640e52' from Blink-1 receives an incorrect 'Ack=1' from Blink-2 causing its retransmission. What could be the reason for this incorrect ACK from Blink-2?<br> (Also note above that we've relayed the final ACKs during the handshake from the Blinks to the other unnecessarily.)<br>2. Although 'SEND Transaction 6ed1199a610a6a7d' from BLink-2 does receive a correct ACK, the 'SEND' keeps getting retransmitted multiple times for some reason by Blink-2. What could be wrong here?<br>3. Is it possible that each Blink isn't sending a '200 OK' to the SENDs received because they're not expecting a SEND? i.e. are they only looking to do a SEND?<br>4. Does Blink support this likely scenario wherein they're both behind NATs and have no option but to use msrp-acm to resolve NAT issues (i.e. have no relays available)?<br>5. It appears Blink-2 is misbehaving i.e. it's sending a wrong ACK and keeps retransmitting an acknowledged TCP segment over and over again.<br> Its logs shows the following error: 'Chat stream failed: MSRPBindSessionTimeout'. Do you agree with this analysis?<br><br>Attached is the wireshark trace file and Blink logs are below. Hope this helps!<br><br><br>Gaurav<br><br><br>Blink-1 logs:<br>2011-03-25 15:36:44 [session to 12345] Changing Session state to CONNECTING<br>2011-03-25 15:36:44 [session to 12345] Connecting Session...<br>2011-03-25 15:36:44 Outgoing Session request to To: <<a href="sip:12345@10.204.1.28">sip:12345@10.204.1.28</a>> (['chat'])<br>2011-03-25 15:36:47 [session to 12345] Session will start<br>2011-03-25 15:36:47 Chat stream established to <a href="msrp://10.207.1.100:15002/8e943e31a8e49a6597f0;tcp">msrp://10.207.1.100:15002/8e943e31a8e49a6597f0;tcp</a> (12345)<br>2011-03-25 15:36:48 [session to 12345] Changing chat state to CONNECTED<br>2011-03-25 15:36:48 [session to 12345@10.204.1.28] Changing Session state to CONNECTED<br>2011-03-25 15:36:48 [session to 12345@10.204.1.28] Session started<br>2011-03-25 15:36:58 [session to 12345@10.204.1.28] Session will end (remote)<br>2011-03-25 15:36:58 [session to 12345@10.204.1.28] Changing Session state to FINISHED<br>2011-03-25 15:36:58 Session <sipsimple.session.Session object at 0x115fa310> ended, disposing...<br>2011-03-25 15:36:58 [session to 12345@10.204.1.28] Session ended<br>2011-03-25 15:36:58 Chat stream ended<br>2011-03-25 15:36:58 [session to 12345@10.204.1.28] Changing chat state to IDLE<br><br>Blink-2 logs:<br>2011-03-25 15:36:44 Incoming session from From: "56789" <<a href="sip:56789@10.204.1.28">sip:56789@10.204.1.28</a>>;tag=3509990736-382361 with proposed streams chat<br>2011-03-25 15:36:47 Accepting session to From: "56789" <<a href="sip:56789@10.204.1.28">sip:56789@10.204.1.28</a>>;tag=3509990736-382361<br>2011-03-25 15:36:47 [session to 56789] Handling incoming chat Stream<br>2011-03-25 15:36:47 [session to 56789] Changing chat state to INCOMING<br>2011-03-25 15:36:47 [session to 56789] Session will start<br>2011-03-25 15:36:57 Chat stream failed: MSRPBindSessionTimeout<br>2011-03-25 15:36:58 [session to 56789] Changing chat state to FAILED<br>2011-03-25 15:36:58 [session to 56789] Session will end (local)<br>2011-03-25 15:36:58 Chat stream ended<br>2011-03-25 15:36:59 [session to 56789] Changing Session state to FINISHED<br>2011-03-25 15:36:59 Session <sipsimple.session.Session object at 0x3439e30> ended, disposing...<br>2011-03-25 15:36:59 [session to 56789] Session ended<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></span><o:p></o:p></p></div><p class=MsoNormal><blink_msrp.pcap>_______________________________________________<br>Blink mailing list<br><a href="mailto:Blink@lists.ag-projects.com">Blink@lists.ag-projects.com</a><br>http://lists.ag-projects.com/mailman/listinfo/blink<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>