Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01

[Magnus Westerlund <[e-mail]>]

On 2013-03-26 10:57, Ali C. Begen (abegen) wrote:
> -----Original Message-----
> From: Magnus Westerlund <[e-mail]>
>>>
>>>> wonder of its persistence behavior as it says to use the MAC of
>>>> the Interface that ones initiate the communication over. With
>>>> multiple interfaces, I can in the context of an application use all
>>>> of these interfaces over a set of calls. Thus it doesn't have
>>>> particular good long term stability either.
>>>
>>> I think it is meant to say the interface over which the initial
>>> connection was made not all other possible interfaces that could be
>>> used during the rtp session.
>>>>
>>
>> The main point I try to get across is that which interface you use for
>> the initial connection varies between different communication
>> establishments. If your goal is to have a long term persistent
>> identifier then you need to store the first one used in the context of
>> an application and use that, rather than take the interface you used for
>> the SIP dialog, or similar, used to establish this particular RTP
>> session(s).
> 
> The text is not saying to use MAC for long-term persistent CNAME. It says
> to use it for *short-term* persistency. Sorry, I am not getting where
> there is unclarity.
> 

Sorry, about the short term vs. long term persistence. My mixup.

I think the text that exist is likely to produce the desired result, but
not really clear. As the aspect that the same short term persistent
CNAME needs to be used over all the RTP sessions part of the same
communication session is not that explicit.

One improvement could be to say:

   o  To produce a short-term persistent RTCP CNAME, an RTP endpoint
      MUST either (a) use the numeric representation of the layer-2
      (Media Access Control (MAC)) address of the interface that is used
      to initiate the initial set of RTP sessions as the "host" part of
                      ^^^^^^^^^^^^^^            ^
its RTCP CNAME or

Cheers

Magnus Westerlund

----------------------------------------------------------------------
Multimedia Technologies, Ericsson Research EAB/TVM
----------------------------------------------------------------------
Ericsson AB                | Phone  [phone]
Färögatan 6                | Mobile [phone]
SE-164 80 Stockholm, Sweden| mailto: [e-mail]
----------------------------------------------------------------------