Re: How to identify application type of MSRP session.

On 10/10/12 4:53 PM, Adrian Georgescu wrote:
>
> On Oct 9, 2012, at 5:24 PM, Paul Kyzivat wrote:
>
>> On 10/9/12 1:16 AM, Prasun Bheri wrote:
>>> Thanks Paul and Adrian.
>>> Does it not create inter-op issues?
>>> What is the best approach to inter-opp with other msrp implementations.
>>
>> Certainly it could.
>>
>
> Can you please provide a real life example about how this can happen?
>
>
>> The issue arises when you try to multiplex multiple "applications" on a single AOR and, I gather, a single dialog. Standardizing such usage would seem to require a new higher level application framework on top of sip. One such framework that comes to mind is IMS.
>
> I am using such single dialog scenario with MSRP and I am not able to find any issue with it. Can you please expand what issue you are referring to.

Presumably you are encoding some "application identifier" somewhere, to 
distinguish between file transfer, screen sharing, etc. (E.g. you could 
be using a=label for this.)

This will work fine as long as you have control over the top level "meta 
application" at each end, and thus can assure that both ends agree on 
how to interpret which application is intended.

But it will stop working as soon as you bring in some different 
application at one end that doesn't understand your application identifiers.

So as long as you only want a proprietary solution there is no problem. 
When you want to open it up you can either convince everybody else to 
follow your defacto proprietary "standard", or you can come back here 
and create a real standard.

	Thanks,
	Paul

> Adrian
>
>>
>> 	Thanks,
>> 	Paul
>>
>>> Thanks & Regards
>>> Prasun
>>>
>>> On Mon, Oct 8, 2012 at 8:14 PM, Paul Kyzivat <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>>     On 10/8/12 3:11 AM, Prasun Bheri wrote:
>>>
>>>         Hello Group,
>>>         I would like to use MSRP for various applications such as IM/File
>>>         Transfer/Screen sharing etc.
>>>
>>>         What is the right way to identify, which MSRP session belongs to
>>>         which
>>>         application?
>>>
>>>         Looking at SDP in SIP INVITE all applications could have same
>>>         accept-types.
>>>
>>>
>>>     AFAIK there are no specific standards for this, but there are
>>>     mechanisms you can use.
>>>
>>>     E.g. you may use the a=label attribute in sdp to associate an m-line
>>>     with a label that is significant to an application.
>>>
>>>              Thanks,
>>>              Paul
>>>
>>>
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>>
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