Re: Media flow managed by 2 terminations

Thanks Albrecht.

I agree. I had also considered your alternatives "1)" and "2)".

I don't undesrtand your alternative "3)". If the D-channel carries 
multiplex of s-, p- or/and f-type frames, you would need a termination 
for each one, not a single termination.

In any case, my main question is: If the D-channel carries multiplex of 
s-, p- or/and f-type frames, which is the best solution?:

a) My first proposal:
+ A physical termination to manage the overall D-channel. When that 
termination detects a packet flow (SAPI 16/TEI x), it would send a 
notify to the MGC.

+ MGC would create an ephemeral termination to manage that packet flow 
(SAPI 16/TEI x) -the same for frame flows (SAPIs 32-62)- and the 
physical termination should continue to manage the rest of packet flows 
(with different TEI) in that D-channel.


b) Your alternative "2)": H.248 Mux termination
   + Circuit 1 = D-channel
   + StreamID = x: p-type (X.25) frames
   + StreamID = x: f-type (FR) frames


Thanks,
Javi





El 15/07/2011 13:24, Schwarz, Albrecht (Albrecht) escribió:
>> Does H.248.1 allow this?
>>      
> I think so.
> Guess that following aspect might be also relevant:
>
> Does the D-channel carry
> a) just a single type of frames (e.g. exclusively X.25 traffic); or
> b) a multiplex of s-, p- or/and f-type frames (e.g., a mix of Q.921 signalling, X.25 packet and frame relay traffic).
>
> Possible alternatives to the considered ephemeral termination for the "X.25/D-channel/{16|64}TDM bearer":
>
> 1) static configuration, i.e., without any H.248 context, see ETSI TS 183002, § 7.3.2.2
> ->  using an X.25-over-SCTP bearer
> ->  7.3.2.4.2	IUA/SCTP for X.25 or frame relay traffic
>
> 2) H.248 Mux termination
> use case here: Figure 9 (ex 6)/H.248.1 - Multiplexed termination scenario - Single-to-multiple terminations
> ->  Circuit 1 = D-channel
> ->  StreamID = x: p-type (X.25) frames
>
> 3) SDP for TDM (old proposal: draft-taylor-mmusic-sdp-tdm-01.txt)
> ->  single physical termination
> ->  initially 'TDM'
> ->  after detection modified to 'PKT/TDM'
>
> The attributes
>     a=netprof:<profile>
>     a=e2eprof:<profile>
> could be used to "profile the D-channel" for the specific type frames
>
>
> Just some thoughts,
> Albrecht
>
>
>
>    
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of Javi
>> Sent: Mittwoch, 13. Juli 2011 17:36
>> To: [email protected]
>> Subject: [Megaco] Media flow managed by 2 terminations
>>
>> Is it possible to manage a same flow by 2 termination (one
>> physical and another ephymeral)?
>>
>>
>> Specifically, I need to manage the packet flows (SAPI 16) in
>> a D-channel
>> ISDN. My proposal is to use:
>>
>> + A physical termination to manage the overall D-channel. When that
>> termination detects a packet flow (SAPI 16/TEI x), it would send a
>> notify to the MGC.
>>
>> + MGC would create an ephemeral termination to manage that
>> packet flow
>> (SAPI 16/TEI x) and the physical termination should continue
>> to manage
>> the rest of packet flows (with different TEI) in that D-channel.
>>
>> Does H.248.1 allow this?
>>
>>
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>>      
>