Edit History

SipDevicesAlgo

Version 3 (Adrian Georgescu, 02/12/2013 06:53 pm)

1 1 Adrian Georgescu 
h1. Algo doorbel
2 1 Adrian Georgescu
3 1 Adrian Georgescu 
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.
4 1 Adrian Georgescu 






    5
    1
    Adrian Georgescu
    
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).






    6
    1
    Adrian Georgescu
    






    7
    1
    Adrian Georgescu
    
The log is below:






    8
    1
    Adrian Georgescu
    






    9
    1
    Adrian Georgescu
    
2013-01-01T00:41:05+01:00 xs4all phone: sip recv 85.17.186.7:5060, size = 2095






    10
    1
    Adrian Georgescu
    
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






    11
    1
    Adrian Georgescu
    






    12
    1
    Adrian Georgescu
    
Expanded messages below for clarity with the relevant headers, notice the Record-Route headers:






    13
    1
    Adrian Georgescu
    






    14
    1
    Adrian Georgescu
    
INVITE sip:1972@192.168.1.9:5060 SIP/2.0






    15
    1
    Adrian Georgescu
    
Record-Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>






    16
    1
    Adrian Georgescu
    
Record-Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>






    17
    1
    Adrian Georgescu
    
Record-Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






    18
    1
    Adrian Georgescu
    
Record-Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






    19
    1
    Adrian Georgescu
    
From: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






    20
    1
    Adrian Georgescu
    
To: <sip:1972@ag-projects.com>






    21
    1
    Adrian Georgescu
    
Contact: <sip:52138976@82.161.39.123:57428;transport=tcp>






    22
    1
    Adrian Georgescu
    
Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






    23
    1
    Adrian Georgescu
    






    24
    1
    Adrian Georgescu
    






    25
    1
    Adrian Georgescu
    
2013-01-01T00:41:06+01:00 xs4all phone: sip send 85.17.186.7:5060, size = 1193






    26
    1
    Adrian Georgescu
    
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






    27
    1
    Adrian Georgescu
    
2013-01-01T00:41:06+01:00 xs4all phone: sip send 85.17.186.7:5060, size = 1421






    28
    1
    Adrian Georgescu
    
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






    29
    1
    Adrian Georgescu
    
2013-01-01T00:41:07+01:00 xs4all phone: sip recv 85.17.186.7:5060, size = 706






    30
    1
    Adrian Georgescu
    
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






    31
    1
    Adrian Georgescu
    
2013-01-01T00:42:05+01:00 xs4all phone: sip send 81.23.228.129:5060, size = 429






    32
    1
    Adrian Georgescu
    
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






    33
    1
    Adrian Georgescu
    
2013-01-01T00:42:05+01:00 xs4all phone: sip recv 81.23.228.129:5060, size = 495






    34
    1
    Adrian Georgescu
    
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






    35
    1
    Adrian Georgescu
    






    36
    3
    Adrian Georgescu
    
h2. Broken BYE






    37
    1
    Adrian Georgescu
    






    38
    1
    Adrian Georgescu
    
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):






    39
    1
    Adrian Georgescu
    






    40
    1
    Adrian Georgescu
    
BYE sip:52138976@82.161.39.123:57428;transport=tcp SIP/2.0






    41
    1
    Adrian Georgescu
    
Via: SIP/2.0/UDP 192.168.1.9:5060;rport;branch=z9hG4bK688014405






    42
    1
    Adrian Georgescu
    
From: <sip:1972@ag-projects.com>;tag=530668702






    43
    1
    Adrian Georgescu
    
To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






    44
    1
    Adrian Georgescu
    
Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






    45
    1
    Adrian Georgescu
    
CSeq: 27636006 BYE






    46
    1
    Adrian Georgescu
    
Allow: INVITE, ACK, CANCEL, BYE, INFO






    47
    1
    Adrian Georgescu
    
Max-Forwards: 69






    48
    1
    Adrian Georgescu
    
User-Agent: Algo 8028 1.7.8






    49
    1
    Adrian Georgescu
    
Content-Length: 0






    50
    1
    Adrian Georgescu
    






    51
    3
    Adrian Georgescu
    






    52
    3
    Adrian Georgescu
    
h2. Correct BYE






    53
    1
    Adrian Georgescu
    






    54
    1
    Adrian Georgescu
    
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):






    55
    1
    Adrian Georgescu
    






    56
    1
    Adrian Georgescu
    
BYE sip:52138976@82.161.39.123:57428;transport=tcp SIP/2.0






    57
    1
    Adrian Georgescu
    
Via: SIP/2.0/UDP 192.168.1.9:5060;rport;branch=z9hG4bK688014405






    58
    1
    Adrian Georgescu
    
From: <sip:1972@ag-projects.com>;tag=530668702






    59
    1
    Adrian Georgescu
    
Route: <sip:81.23.228.129;transport=tcp;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






    60
    1
    Adrian Georgescu
    
Route: <sip:81.23.228.129;r2=on;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.b5809b45>






    61
    1
    Adrian Georgescu
    
Route: <sip:85.17.186.7;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.908d838>






    62
    1
    Adrian Georgescu
    
Route: <sip:81.23.228.129;lr;ftag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks;did=1a8.c5809b45>






    63
    1
    Adrian Georgescu
    
To: "Adrian Georgescu" <sip:ag@ag-projects.com>;tag=x0VdFW8sEn3bymiNLIQFWpc7Bqe0Hmks






    64
    1
    Adrian Georgescu
    
Call-ID: YsTJTTdp5Kxb6eYrxDqViOkl2GaJUCd7






    65
    1
    Adrian Georgescu
    
CSeq: 27636006 BYE






    66
    1
    Adrian Georgescu
    
Allow: INVITE, ACK, CANCEL, BYE, INFO






    67
    1
    Adrian Georgescu
    
Max-Forwards: 69






    68
    1
    Adrian Georgescu
    
User-Agent: Algo 8028 1.7.8






    69
    1
    Adrian Georgescu
    
Content-Length: 0






    70
    1
    Adrian Georgescu
    






    71
    1
    Adrian Georgescu
    






    72
    1
    Adrian Georgescu
    
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.