[OpenSIPS-Devel] [B2B_ENTITIES] Difference between sending CANCEL and BYE

Olivier Détour chino540off+kamailio at gmail.com
Fri Jan 22 18:55:21 CET 2010


I would like to break a SIP communication during a call or a
proceeding SIP session...

If the call is in progress (Caller can speak to Callee), I can send a
BYE to caller and callee each with send_request function;
Here is my Wireshark trace:

BYE sip:sa at SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bKda73.5742b3a7.0
From: <sip:11 at>;tag=934c0604001f8a49c065a1707fbb682d-59cf
To: <sip:21 at>;tag=B2B.333.0.1264181639
CSeq: 4 BYE
Call-ID: B2B.269.0.1264181639
Content-Length: 0
User-Agent: OpenSIPS (1.6.1-notls (i386/linux))
Contact: <sip:sa at>

If the sip session is proceeding (Caller send INVITE but he hasn't
receive 200 OK yet), I send a CANCEL
like I sent the BYE (send_request);
But here is my Wireshark trace:

CANCEL sip:22 at SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bK5161.0ab21263.0
From: <sip:11 at>;tag=934c0604001f8a49c065a1707fbb682d-ac1f
To: sip:22 at
Call-ID: B2B.134.0.1264181129
User-Agent: OpenSIPS (1.6.1-notls (i386/linux))
Contact: <sip:sa at>

Why is the Request Line not for sip:sa at as for the BYE?


Olivier Détour
Sent from Paris, Île-de-France, France

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