[Serusers] Header and To changing.

[Mike Tkachuk]

Hello Greg,

Friday, September 24, 2004, 9:08:33 PM, you wrote:

GF> Keith,

GF> If I'm not mistaken, the From and To form part of the request's dialog
GF> 'key' along with the callid.  To cannot be changed.  If you did change
GF> To
GF> in the Level3 direction, when the request comes back you would have to
GF> replace the
GF> original 'To' from the UAC.  I think this is, in effect, a psuedo b2bua.

GF> I agree with Jiri, the request uri is what is important.  However, you
GF> know what they say about the 1000 pound gorilla :-)

GF> -g


GF> On Sep 24, 2004, at 11:13 AM, TSS Support wrote:

>>
>> From: "Jiri Kuthan" <jiri at iptel.org>
>>> Then the provider is using VERY questionnable policy and ought to 
>>> look only
>>> at request-uri.
>>> * is a B2BUA -- it does not rewrite, it generates everything on its
>>> own.
>>> I personally think B2BUA is in most cases very suboptimal technology.
>>> Scalability is an example, even if it does not matter in baby-sized
>>> setups.
>>> B2BUa security model is questionnable too.
>>
>>
>> See, this is the problem. The provider is Level3. We are trying to use
>> their Enhanced Local service rather than provide all of the toll 
>> calling over our trunks. They insist that there must be e.164 
>> formatted addresses in all header fields: From, To, and Request-URI.
>> The first and last are easy. It seems the only solution to fix the 
>> middle one is to add a B2BUA or go in and patch SER. We don't want to
>> add another point of failure, so it's likely we'll end up adding 
>> t_relay_to_level3() or something like that.
>>
>> -Keith, TSS

I'm not sure 100%, I'm not SIP guru, but as I remember dialog should
be identified by totag, fromtag and callid.


-- 
Best regards,

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