SIP Session Termination using BYE

BYE causes the media session to be torn down. Note: BYE like INVITE is an end-to-end method.

Transcript

[slide149] Now at the end of the session, we said there was a BYE. Either party could decide to say BYE. Now one problem is that what happens whenever I get the BYE? I tear down the session. Right? Anyone see a problem with this? Well if I want to do a denial of service attack, what do I do? I just flood BYE messages and Alice is never able to maintain a session with Bob because somebody keeps hanging them up. Oops, there's a problem. So that means we need to have security to make sure that it's the BYE that goes with Alice's initiation of the session, otherwise we should ignore it.