[pjsip] Service-route overriding proxy

Olivier Beytrison olivier at heliosnet.org
Sun Nov 4 06:33:11 EST 2007


Hello benny :)

Just wondering what you decided about this service-route issue ?

Regards,

Olivier B.

Benny Prijono a écrit :
> Okay, thanks for the info.
> 
> So is appending Service-Route to existing/preconfigured route set 
> the best approach? Any potential pitfalls with this? (I can't think 
> of any).
> 
>   -benny
> 
> 
> Olivier Beytrison wrote:
>> let me quote the book "The IMS IP Multimedia Concepts and Services" from
>> Wiley
>>
>> Page 180 reguarding the 200 OK returned from a successful Registration
>>
>> ""
>> The UE, when receiving the 200 (OK) response, will store the entries in
>> the Service-Route header. Whenever the UE sends out any initial
>> requestion other than a REGISTER message, it will :
>>
>> * include the addresses that were received in the Service-Route header
>>   within a Route header of the initial requests; and
>> * include the P-CSCF address as the topmost Route entry in the initial
>>   request.
>>
>> ""
>>
>> should clear your doubts :)
>>
>> Regards,
>>
>> Olivier
>>
>> Benny Prijono a écrit :
>>> Klaus Darilion wrote:
>>>> Olivier Beytrison schrieb:
>>>>> I don't think so. Because th P-CSCF address will be mostly assigned by
>>>>> DHCP Option. Because when you're are moving with your device, you move
>>>>> from one area to another one covered by annother GGSN, which mean you'll
>>>>> have to contact a new P-CSCF, this without invalidating your registration.
>>>> In the 3G book from Gonzalo Camarillo, the Service Route only includes 
>>>> the S-CSCF (no P and no I).
>>> Thanks for joining the discussion, Klaus. I think I must have 
>>> misunderstood RFC 3608 Section 6.1, which I thought says that the 
>>> Service-Route headers replace the whole route set configured in the UA.
>>>
>>> So as a confirmation, is it correct to append Service-Route headers 
>>> into existing route set?
>>>
>>>   -benny
>>>
>>>
>>>> Nevertheless I think Benny is right: without reREGISTRATION after 
>>>> changing the P-CSCF the client can not receive incoming calls (still 
>>>> routed to old P-CSCF using the old path).
>>>>
>>>> klaus
>>>
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> 
> 

-- 

 Olivier Beytrison
 Telecommunication Engineer
 Mobile: +41 (0)78 619 73 53
 Mail: olivier at heliosnet.org
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