Hi List
At the moment, we challenge every invite (and re-invite) to make sure the customer is authenticated.
Now we have one kind of PBX, which never does not authenticate when we challenge a Re-Invite.
According to the vendor of that PBX's RFC interpretation, answering a challenge to a re-invite is optional. If that is ignored by the PBX, then the existing established dialog shall not end.
Unfortunately this causes the session timer to run out.
I am therefore wondering, if there is a safe way not to challenge re-invites.
A Re-Invite contains a To-Tag. So I could bypass authentication on presence of a to-Tag. But then, how do I prevent a customer to just set a spoofed To-Tag to circumvent authentication?
Is there a feasible way?
Mit freundlichen Grüssen
-Benoît Panizzon-