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Call Trace - SIP INFO Subscribe-Notify

Example Trace

The following is an example call trace showing SIP Subscribe Notify for DTMF. Related lines have a "→" as a prefix.

---> [10.129.55.74, 5060]
       SUBSCRIBE sip:8519@10.129.55.80:5060 SIP/2.0
       Via: SIP/2.0/UDP 10.129.55.74:5060
       From: 7340 <sip:7340@10.129.55.74:5060>;tag=1
       To: 8519 <sip:8519@10.129.55.80:5060>;tag=a94c095b773be1
       dd6e8d668a785a9c84113d
       Call-id: 1-2104@10.129.55.74
    -> Cseq: 1 SUBSCRIBE
       Contact: <sip:sipp@10.129.55.74:5060; transport=UDP>
    -> Event: telephone-event;duration=300
       Expires: 600
       Content-Length: 0
                                                           
18:17:08.733 SIP (W) 
       <--- [10.129.55.74, 5060 <- 10.129.55.80, 5060]
        SIP/2.0 200 OK
       Via: SIP/2.0/UDP 10.129.55.74:5060;received=10.129.55.74
       Call-ID: 1-2104@10.129.55.74
       From: 7340 <sip:7340@10.129.55.74:5060>;tag=1
       To: 8519 <sip:8519@10.129.55.80:5060>;tag=a94c095b773be1
       dd6e8d668a785a9c84113d
    -> CSeq: 1 SUBSCRIBE
       Server: Cantata-SIP/10.3.3.129 SIP-Gateway1 0
       Expires: 600
       Content-Length: 0
       <--- [10.129.55.74, 5060 <- 10.129.55.80, 5060]
    -> NOTIFY sip:sipp@10.129.55.74:5060 SIP/2.0
       Via: SIP/2.0/UDP 10.129.55.80:5060; rport;branch=z9hG4bK- 5c5e-1163009828-19999-33
       Call-ID: 1-2104@10.129.55.74
    -> CSeq: 1 NOTIFY
       Max-Forwards: 70
       To: <sip:7340@10.129.55.74>;tag=1
       From: <sip:8519@10.129.55.80>;tag=a94c095b773be1dd6e8d668a785a9c84113d
       User-Agent: Cantata-SIP/10.3.3.129 SIP-Gateway1 0
    -> Event: telephone-event;duration=300
       Subscription-State: Active;expires=600
       Content-Length: 0
                       
                                              
18:17:08.753 SIP (W) 
        ---> [10.129.55.74, 5060]
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 10.129.55.80:5060; rport;branch=z9hG4bK- 5c5e-1163009828-19999-33
        From: <sip:8519@10.129.55.80>;tag=a94c095b773be1dd6e8d668a785a9c84113d
        To: <sip:7340@10.129.55.74>;tag=1;tag=1
        Call-ID: 1-2104@10.129.55.74
     -> CSeq: 1 NOTIFY
        Contact: <sip:10.129.55.74:5060; transport=UDP>
        Content-Length: 0
  
NOTIFY sip:sipp@10.129.55.74:5060 SIP/2.0
         Via: SIP/2.0/UDP 10.129.55.80:5060; rport;branch=z9hG4bK-d37-1163009863-19998-33
         Call-ID: 1-2104@10.129.55.74
         CSeq: 2 NOTIFY
         Max-Forwards: 70
         To: <sip:7340@10.129.55.74>;tag=1
         From: <sip:8519@10.129.55.80>;tag=a94c095b773be1dd6e8d668a785a9c84113d
         User-Agent: Cantata-SIP/10.3.3.129 SIP-Gateway1 0
      -> Event: telephone-event;duration=300
         Subscription-State: Active;expires=125
         Content-Type: application/ dtmf-relay
         Content-Length: 26
         Signal= #
         Duration= 160
                                                                     
18:17:43.893 SIP (W) 
      ---> [10.129.55.74, 5060]
      SIP/2.0 200 OK
      Via: SIP/2.0/UDP 10.129.55.80:5060;rport;branch=z9hG4bK-d37-1163009863-19998-33
      From: <sip:8519@10.129.55.80>;tag=a94c095b773be1dd6e8d668a785a9c84113d
      To: <sip:7340@10.129.55.74>;tag=1;tag=1
      Call-ID: 1-2104@10.129.55.74
   -> CSeq: 2 NOTIFY
      Contact: <sip:10.129.55.74:5060;transport=UDP>
      Content-Length: 0
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