[Serusers] rewrite the From part of SIP INVITE messages

[Ricardo Carvalho]

I've used subst() function for substituting From and To URIs and calls 
succeed well! I think that this indicates that Ser uses in fact only the 
Call-Id to keep track of calls and not as well From and To tags of 
messages. Although I agree... this may end up biting me later... It got 
to be a question of compromises between pros and cons!

Greetings,

Ricardo.






Greger V. Teigre wrote:
> NEVER manipulate From/To so that tag=something disappears!!  Per 
> RFC3261, a dialog is the combination of these two tags and Call-Id.  
> On branching and reINVITE, the Call-Id will stay the same, while the 
> tags may change.  This is relevant for accounting, for keeping track 
> of branches, failures, and is absolutely necessary for the UAs to 
> recognize the dialog.
> The old RFC uses the full content of From/To for the same purposes, 
> thus manipulating From/To will break your backwards suport for 
> UACs/UASs that do not support RFC3261. This means that in a 
> closed-wall deployment and all UAS/UAC support RFC3261, you MAY 
> manipulate From/To, but it's not recommended and may well end up 
> biting you later...
> g-)
>
> Alexandr Dubovikov wrote:
>> On Sat, Aug 26, 2006 at 07:55:41PM +0100, rcarvalho at iric.up.pt wrote:
>>   
>>> I'm sceptic about the use of functions that replace parts of SIP messages,
>>> because that way, will Ser still keep record of transactions? Won?t those
>>> replacements affect Ser to recognise to whom route subsequent messages?
>>>
>>> Regards,
>>>
>>> Ricardo.
>>>     
>>
>> Yep, we already discused here about it one week ago. From, To and Call-ID make a 
>> Call Leg of transaction. I am not sure, but ser tm based only on Call-ID and
>> ignore To/From fields.
>>
>>
>>
>> Wbr,
>>