Re: [Simple] COMEDIA vs MSRP Relays: Shared Connections

["Christer Holmberg" <christer.holmberg at ericsson.com>]

Hi,
 
Section 4.1.3 talks about the connection attribute.
 
Regards,
 
Christer
 

________________________________

From: simple-bounces at ietf.org on behalf of Ben Campbell
Sent: Wed 22/07/2009 00:31
To: Hadriel Kaplan
Cc: Simple WG
Subject: Re: [Simple] COMEDIA vs MSRP Relays: Shared Connections




On Jul 21, 2009, at 5:14 PM, Hadriel Kaplan wrote:

>
> I'm not sure I follow you - Comedia has a "connection:existing" 
> attribute setting to re-use the same connection (e.g., in a new 
> offer).  Or do you mean of two separate media m= lines?

You are right of course. Brain fart on my part. However, the draft 
should probably mention how to apply this--the only reference I see to 
connection:existing is in the ICE section.



>
> -hadriel
>
>> -----Original Message-----
>> From: simple-bounces at ietf.org [mailto:simple-bounces at ietf.org] On 
>> Behalf
>> Of Ben Campbell
>>
>> How does the COMEDIA negotiation interact with the TCP-connection-
>> sharing features of MSRP? We negotiate sessions in the SDP offer/
>> answer, not connections per se. COMEDIA implicitly assumes a one-to-
>> one correspondence between these, but MSRP explicitly allows multiple
>> sessions to use the same TCP connection.
>>
>> I can see two approaches. One would be that the COMEDIA attributes 
>> are
>> only relevant if you have to create a new connection. If a reusable
>> connection already exists, you just use it. Alternatively, we could
>> state that a connection is only reuseable if it's direction matches
>> the COMEDIA attributes, and if devices wanted to reuse an existing
>> connection, they would either omit COMEDIA entirely, or choose 
>> COMEDIA
>> attributes that match the connection.
>>
>> Neither of those approaches seems obviously wrong to me. I suspect
>> there may be some traps here, though--we should analyze this pretty
>> closely.
>>
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