We are trying to receive a sip cancel request to a prior received initial invite from the same subscriber. Our server sends out a 100 and after having connected to a media server it sends 183 to the subscriber. After that the cancel comes from the subscriber, but it is not forwarded to our sbb. We were not sure what event we have to implement, is it a cancel, a dialog cancel or maybe a dialog terminated. So we have implemented all of them, but there is no callback on any of them and we get a 501. We have attached the sbb to the activity context when we send out the 183. Please can you help us and tell us what is wrong here.
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