3 Apr
2004
3 Apr
'04
1:34 a.m.
Jason Penton wrote:
>>>>Yes - I have. BUT I was under the impression that the 180 RINGING
>>>>response is not REQUIRED to have a to-tag i.e. to set up an
>>>early dialog.
>>>
>>>>Is this understanding correct?
>>>
>>>indeed, to-tags serve the purpose if establishing a dialog.
>>>180 does not establish any, only 183 does.
I disagree. The only difference between 180 and 183 is that 180
signifies that the callee is being alerted. Either may establish a
dialog, or not.
>>So then to fix the problem I am having - I
could
>theoretically remove
>>the to-tags from all incoming 180 RINGING responses before
>forwarding
>>them to the UAC and my problem should be solved.
You could also remove the call-id header too, but I wouldn't recommend
it. The to-tag can validly be there. You can start playing games to work
around bugs in devices you encounter, but that will be dangerous.
Paul