[Serusers] rewrite the From part of SIP INVITE messages

[Greger V. Teigre]

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,
>   
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