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SipDevicesAlgo

Version 1 (Adrian Georgescu, 02/12/2013 06:52 pm)

1 1 Adrian Georgescu 
h1. Algo doorbel
2 1 Adrian Georgescu
3 1 Adrian Georgescu 






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BYE message generated by the unit is 1st) broken (the Router headers are missing) and 2nd) sent to the wrong next hop.






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I paste again the bug report describing the issue which you can reproduced with any SIP service provider that uses multiple SIP Proxies for the same domain like http://sip2sip.info






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<<<<<<






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The unit is not able to correctly terminate the calls when the next hop is a state-full SIP Proxy. A state-full SIP Proxy uses record route to maintain the same signaling path for all subsequent messages part of the same dialog. The unit does not handle this situation, which is standard setup of any VoIP provider that uses a SIP Proxy instead of using a VoIP switch like Asterisk or FreeSwitch, which behave like an end-point. 






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Secondly, the unit does not correctly send the BYE to the right next hop when there is more than one SIP server for the same domain (regardless of whether it is a SIP Proxy or not).






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The log is below:






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2013-01-01T00:41:05+01:00 xs4all phone: sip recv 85.17.186.7:5060, size = 2095






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2013-01-01T00:41:05+01:00 xs4all phone: [truncated] INVITE sip:1972@192.168.1.9:5060 SIP/2.0#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.a08d838>#015#012Record-Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>#015#012Record-Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012Record-Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.28ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.338f5a74.0#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.18ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.238f5a74.0;i=7db2#015#012Via: SIP/2.0/tcp 192.168.1.57:57428;received=82.161.39.123;rport=57428;branch=z9hG4bKPjkhvJ8eoLpQhZKMzod4XgVhJZrJxAEtUe#015#012Max-Forwards: 66#015#012From: "Adrian Georgescu" <sip:ag@ag-projects.c






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Expanded messages below for clarity with the relevant headers, notice the Record-Route headers:






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INVITE sip:1972@192.168.1.9:5060 SIP/2.0






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Record-Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>






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Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>






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Record-Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






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Record-Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






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From: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






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To: <sip:1972@ag-projects.com>






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Contact: <sip:52138976@82.161.39.123:57428;transport=tcp>






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Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






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2013-01-01T00:41:06+01:00 xs4all phone: sip send 85.17.186.7:5060, size = 1193






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2013-01-01T00:41:06+01:00 xs4all phone: [truncated] SIP/2.0 180 Ringing#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.28ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.338f5a74.0#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.18ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.238f5a74.0;i=7db2#015#012Via: SIP/2.0/tcp 192.168.1.57:57428;received=82.161.39.123;rport=57428;branch=z9hG4bKPjkhvJ8eoLpQhZKMzod4XgVhJZrJxAEtUe#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.a08d838>#015#012Record-Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>#015#012Record-Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012Record-Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012From: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmk






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2013-01-01T00:41:06+01:00 xs4all phone: sip send 85.17.186.7:5060, size = 1421






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2013-01-01T00:41:06+01:00 xs4all phone: [truncated] SIP/2.0 200 OK#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.28ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.338f5a74.0#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.18ff94f5.0#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.238f5a74.0;i=7db2#015#012Via: SIP/2.0/tcp 192.168.1.57:57428;received=82.161.39.123;rport=57428;branch=z9hG4bKPjkhvJ8eoLpQhZKMzod4XgVhJZrJxAEtUe#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.a08d838>#015#012Record-Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>#015#012Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>#015#012Record-Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012Record-Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>#015#012From: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks#015#012To






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2013-01-01T00:41:07+01:00 xs4all phone: sip recv 85.17.186.7:5060, size = 706






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2013-01-01T00:41:07+01:00 xs4all phone: ACK sip:1972@82.161.39.123:61031 SIP/2.0#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.18ff94f5.2#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.238f5a74.2#015#012Via: SIP/2.0/UDP 85.17.186.7:5060;branch=z9hG4bK0159.18ff94f5.2#015#012Via: SIP/2.0/UDP 81.23.228.129:5060;branch=z9hG4bK0159.238f5a74.2;i=7db2#015#012Via: SIP/2.0/tcp 192.168.1.57:57428;received=82.161.39.123;rport=57428;branch=z9hG4bKPj6Uyn5PV6pApqRSblxHYaZ-7P.0Aid2IR#015#012Max-Forwards: 66#015#012From: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks#015#012To: <sip:1972@ag-projects.com>;tag=530668702#015#012Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7#015#012CSeq: 31053 ACK#015#012User-Agent: Blink Pro 2.0.3 (MacOSX)#015#012Content-Length:  0#015#012#015






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2013-01-01T00:42:05+01:00 xs4all phone: sip send 81.23.228.129:5060, size = 429






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2013-01-01T00:42:05+01:00 xs4all phone: BYE sip:52138976@82.161.39.123:57428;transport=tcp SIP/2.0#015#012Via: SIP/2.0/UDP 192.168.1.9:5060;rport;branch=z9hG4bK688014405#015#012From: <sip:1972@ag-projects.com>;tag=530668702#015#012To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks#015#012Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7#015#012CSeq: 27636006 BYE#015#012Allow: INVITE, ACK, CANCEL, BYE, INFO#015#012Max-Forwards: 70#015#012User-Agent: Algo 8028 1.7.8#015#012Content-Length: 0#015#012#015






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2013-01-01T00:42:05+01:00 xs4all phone: sip recv 81.23.228.129:5060, size = 495






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2013-01-01T00:42:05+01:00 xs4all phone: SIP/2.0 200 OK#015#012Via: SIP/2.0/UDP 192.168.1.9:5060;rport=61031;received=82.161.39.123;branch=z9hG4bK688014405#015#012Record-Route: <sip:81.23.228.129;transport=tcp;lr;r2=on;ftag=530668702>#015#012Record-Route: <sip:81.23.228.129;lr;r2=on;ftag=530668702>#015#012Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7#015#012From: <sip:1972@ag-projects.com>;tag=530668702#015#012To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks#015#012CSeq: 27636006 BYE#015#012Server: Blink Pro 2.0.3 (MacOSX)#015#012Content-Length:  0#015#012#015






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Algo sends this BYE message, which never arrives at the original destination as the intermediate SIP proxy has no information where to route it (it has no Route headers):






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BYE sip:52138976@82.161.39.123:57428;transport=tcp SIP/2.0






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Via: SIP/2.0/UDP 192.168.1.9:5060;rport;branch=z9hG4bK688014405






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From: <sip:1972@ag-projects.com>;tag=530668702






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To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






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Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






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CSeq: 27636006 BYE






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Allow: INVITE, ACK, CANCEL, BYE, INFO






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Max-Forwards: 69






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User-Agent: Algo 8028 1.7.8






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Content-Length: 0






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The correct BYE message must be (observe the missing Route headers that the unit must add, they must be copied in reverse order from the original INVITE Record-Route headers same when Algo was building the 200 OK message, which incidentally is done correctly):






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BYE sip:52138976@82.161.39.123:57428;transport=tcp SIP/2.0






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Via: SIP/2.0/UDP 192.168.1.9:5060;rport;branch=z9hG4bK688014405






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From: <sip:1972@ag-projects.com>;tag=530668702






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Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






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Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






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Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>






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Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>






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To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






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Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






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CSeq: 27636006 BYE






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Allow: INVITE, ACK, CANCEL, BYE, INFO






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Max-Forwards: 69






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User-Agent: Algo 8028 1.7.8






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Content-Length: 0






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Also the BYE message must be sent exactly to the IP:port where you have received the INVITE from and not by performing a DNS lookup. By doing a DNS lookup you may find another SIP Proxy from the same domain that has no knowledge about this dialog, there should never be a DNS lookup performed in the middle of an established SIP dialog, the standard is explicit about this behavior.