I suspect what you want is a lost cause. MSRP was adopted in part
*because* of objections to use of MESSAGE in that way.
Paul
Vikram Chhibber wrote:
> I strongly feel that IETF should define a standard where
> media-description is defined to propagate SIP MESSAGE as session-mode.
> This way small applications like synchronization of some part of my
> address boob with peer etc. can be developed where MSRP will be an
> overkill and page-mode messaging may have performance impact on the
> network.
> Any opinion on this?
>
> On Nov 15, 2007 7:40 PM, Paul Kyzivat <[EMAIL PROTECTED]> wrote:
>>
>> ???? wrote:
>>> Hi,
>>> I am not sure of your use case but I think your requirement could be
>>> achieved if you send INVITE/ACK without any content (SDP media or something
>>> else). This will make session hence end-to-end dialog for you.
>> I beg to differ. If you send the INVITE without any content then it is
>> an offerless invite. In that case the UAS is obligated to send an offer
>> in its response.
>>
>> Of course it *could* send an offer with no media, but most UAs would
>> offer media in that case. And of course if it did offer you media you
>> could accept the call but refuse the media, which would arrive at the
>> same place that sending an offer with no media would.
>>
>> But if you intent going in is to establish a call with no media, then
>> you are better off being explicit about it. Take a case where the call
>> is forked to devices with different capabilities - e.g. a phone that
>> only does voice as well as a device that does this
>> session-mode/page-mode thing. If you make your offer then the phone can
>> refuse the call. If you make an offerless invite then it will most
>> likely respond.
>>
>> Paul
>>
>>
>>> Vipul Rastogi
>>> Engineer, Business Management Team
>>> Telecommunication Network Business
>>> Samsung Electronics CO, LTD
>>> Suwon P.O.BOX 105, 416
>>> Korea 442-600
>>> MO 010-9530-0354
>>> ----- Original Message -----
>>> From: "Vikram Chhibber" <[EMAIL PROTECTED]>
>>> To: <[email protected]>
>>> Sent: Wednesday, November 14, 2007 11:15 PM
>>> Subject: [Sip-implementors] page-mode instant-messaging question
>>>
>>>
>>>> Hi,
>>>>
>>>> I want to perform page-mode instant messaging (using SIP MESSAGE) on a
>>>> dialog created by INVITE. This INVITE I want for establishing a dialog
>>>> on which I can send SIP MESSAGE only and there will be no media. I do
>>>> not want msrp either.
>>>> In this case, how should I construct offer and then answer SDP?
>>>> SDP with no m line should be fine but is there some media description
>>>> defined for this purpose?
>>>>
>>>> Thanks,
>>>> ~Vikram
>>>> _______________________________________________
>>>> Sip-implementors mailing list
>>>> [email protected]
>>>> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>>>>
>>>>
>>> _______________________________________________
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>>>
>
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