I agree with Nataraju. In general a UA should not be including anything
it doesn't understand it its requests or responses. If a request
contains unknown headers they shouldn't be included in the corresponding
responses.
This is in contrast to the behavior of a proxy, which should be passing
through headers and body parts that it doesn't understand.
Paul
[EMAIL PROTECTED] wrote:
> Comments inline...
>
> Regards,
> Nataraju A B
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On
>> Behalf Of praveen dandin
>> Sent: Thursday, December 13, 2007 11:56 AM
>> To: Attila Sipos; Sip-implementors@lists.cs.columbia.edu
>> Subject: Re: [Sip-implementors] Is session-expires be sent in
>> 2xx responseeventhough UAS doesnt support session timer?
>>
>> Thanks for the response. My actual doubt is whether the UAS
>> MUST NOT (or it SHOULD NOT) send the session-expires header
>> in 2xx when received INVITE has session-expires header and
>> UAS does not support session timer. In other words, should
>> 2xx contain NO Session-Expires header in all cases or there
>> exist some exceptions?
>>
> [ABN] Since UAS does not understand Session timers concept. There is no
> question of sending Session-Expires header in response also SE header
> received in INVITE would be discarded...
>
>> Thanks,
>> Praveen Dandin
>>
>> Attila Sipos <[EMAIL PROTECTED]> wrote:
>> >>This is as per section 9 statement of draft:
>> draft-ietf-sip-session-timer-10.txt
>>>> If the UAS wishes to accept the request, it copies the
>> value of the
>>>> Session-Expires header field from the request into the 2xx
>> response.
>>
>> I think you have misunderstood the text.
>>
>> "accept the request" means accept the request to do session
>> timer, not accept the SIP request.
>>
>> If you look in the text above (paragraph 1 of "9.UAS Behavior") :
>> "The UAS must respond to a request for a session timer by the
>> UAC or a proxy in the path of the request, or it may request
>> that a session timer be used itself."
>>
>> For SIP requests, the UAS does not have to do anything
>> special to accept it.
>>
>> If the UAS doesn't support any session timer functionality,
>> it should just ignore the session timer headers. Do not just
>> blindly copy the session timer headers!!
>>
>> By the way, in case you don't know, RFC 4028 is the most
>> up-to-date version of the "SIP session timer" specification
>> http://www.ietf.org/rfc/rfc4028.txt
>>
>> Regards,
>>
>> Attila
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On
>> Behalf Of praveen dandin
>> Sent: 12 December 2007 15:03
>> To: Sip-implementors@lists.cs.columbia.edu
>> Subject: [Sip-implementors] Is session-expires be sent in 2xx
>> response eventhough UAS doesnt support session timer?
>>
>> Hi all,
>> I have a query regarding session timer functionality. UAC
>> sends the INVITE message with Session-Expires header. The UAS
>> does not support session timer fuctionality. Now possible
>> behaviour of UAS are:
>> 1) UAS copies the value of Session-Expires header value into
>> 2xx and sends the response to UAC.
>> This is as per section 9 statement of draft:
>> draft-ietf-sip-session-timer-10.txt
>> If the UAS wishes to accept the request, it copies the value
>> of the Session-Expires header field from the request into the
>> 2xx response.
>> Here it is not mentioned that whether the UAS is supporting
>> session timers or not.
>> 2) The UAS MUST NOT send Session-Expires in 2xx response.
>> Section 7.2 statement of draft :draft-ietf-sip-session-timer-10.txt
>> gives some info regarding this.
>> It is possible that the UAC requested session timer (and thus
>> included a Session-Expires header field in the request), but
>> there was no Require or Session-Expires header field in the
>> 2xx response. This will happen when the UAS doesn't support
>> the session timer extension, and only the UAC has asked for a
>> session timer (no proxies have requested it).
>> Please let me know the correct behaviour of UAS.
>>
>> Also the draft says that the session timer extension has the
>> property that it works even when only one UA in a dialog
>> supports it. So what should be the behaviour of UAC (which is
>> supporting session timers) in case UAS does not support
>> session timers?.
>>
>> Thanks,
>> Praveen Dandin
>>
>>
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