[asterisk-dev] Improving how Asterisk handles forked SIP requests.

[Olle E. Johansson]

19 jul 2010 kl. 16.46 skrev David Vossel:

> 
> 
> 
> ----- Original Message -----
>> From: "Klaus Darilion" <klaus.mailinglists at pernau.at>
>> To: asterisk-dev at lists.digium.com
>> Sent: Monday, July 19, 2010 8:01:52 AM
>> Subject: Re: [asterisk-dev] Improving how Asterisk handles forked SIP requests.
>> Am 19.07.2010 07:22, schrieb David Vossel:
>>> --- Forking issues this will not fix.
>>> 
>>> One issue this does not resolve is forked requests with different
>>> request URIs that require Authorization. When Authorization is
>>> required the totag won't be provided until the second transaction of
>>> the dialog. With my current patch it is impossible guarantee a
>>> correct dialog match for the second transaction of these dialogs. I
>>> do not yet have a simple solution for this.
>> 
>> The first transaction (without credentials) is not related to the
>> second
>> transaction (with credentials) - at least within the SIP transaction
>> layer. The first transaction does not create a dialog.
>> 
>> regards
>> Klaus
>> 
>> PS: A pure SIP transaction layer would be great!
>> 
> 
> Now this makes sense.  Thanks Klaus.  A transaction layer would be awesome.  It really feels like anything I am attempting to do here is a hack, but outside of re-writing chan_sip I'm not sure what other option we have.

Well, what Klaus says is formally correct, but in practise not followed by most implementations, they treat both transactions as a dialog. As I said, you can cheat a bit by checking a lot of data and making sure you have a valid nonce that you recognize.

/O