Re: draft-ietf-sip-199-03: comments and questions

Hi, 

>>I am still not sure I understand. Even if the device answers quickly,
the proxy can still send 199 if it receives an error response.
>
>I agree.  However the section 6.1 paragraph 2 text indicates that the
proxy MUST send 199. 
>
>I'd prefer that it is downgraded to a SHOULD to allow the 199 to be
avoided when proxy redirecting to something expected to answer quickly.
>
>For instance consider, call-forward-no-answer to voice mail.  After
early dialog established and no-answer timer expires, the proxy sends
CANCEL and forks the INVITE to voice-mail server expected to 
>answer quickly.  The current text indicates that proxy MUST send 199 if
487 received before the INVITE 200.

Aaah, now I understand. The voice mail will send 200 quickly, so the
early dialog between the UAC and the UAS will be terminated anyway,
without a need to send 199.

I guess we could say that the proxy can be configured not to send 199,
if a 200 is expected quickly, or something like that.

>>>Two alternative solutions I can think of:
>>> 
>>>1. We mandate a forking proxy which supports
>>>199 to store the C/R-R information received from the UAC, in order 
>>>to insert it in any
>>>199 it generates for that session.
>>> 
>>>2. We say that IF the forking proxy stores the C/R-R information 
>>>received from the UAC, it shall insert it in any 199 it generates 
>>>for that session.
>>
>>Either alternative is OK with me.
>> 
>>I checked 3261, and if I remember correctly C/R-R are not mandatory, 
>>so I would propose option 2.
>
>I just noticed that you indicated "received from the UAC".  Did you
mean "received from the UAS"?  If not, would the proxy insert it's own
Contact?

I meant received from the UAS :)

Regards,

Christer
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