Re: TDMPW and MeGaCo/SDP

H.248 MUX termination (N x B channels) is a good choice at ISDN termination.

But, at IP side, we still need to describe TDMoIP in SDP. For instance, 
we may propose any like this:

m=audio <puerto> RTP/AVP <PT_dinámico>
a=rtpmap:<PT_dinámico> TDMoIP/8000





El 31/01/2011 16:54, Schwarz, Albrecht (Albrecht) escribió:
> /Just some high-level indications:/
> //
> /Multirate means effectively N-out-of-K (with K = 24 or 30 dependent 
> on ANSI /ETSI markets; and 1 < N <= K)./
> /That's a first requirement./
> /Secondly, the selection of channels may be random, they must not be 
> in consecutive order (e.g., think about the permutations for N = 5)./
> /Thirdly, there could be a dependency of the choosen CESoIP emulation 
> service to the H.248 connection model./
> //
> /Possible solution: H.248 MUX termination ... at the high-level .../
> //
>
>     ------------------------------------------------------------------------
>     *From:* Javi [mailto:[email protected]]
>     *Sent:* Montag, 31. Januar 2011 11:47
>     *To:* [email protected]
>     *Subject:* Re: [Megaco] TDMPW and MeGaCo/SDP
>
>     I agree, TDMoIP is an option only.
>
>     But, if it is used, MGC would use SDP at Local/Remote MeGaCo
>     descriptors. How may be that SDP description for TDMoIP?
>
>>     However, there was never any H.248 Profile standardized with
>>     /*multirate*/ support, at least to my knowledge.
>>     (I'm aware of vendor specific profile, but that are proprietary
>>     solutions.)
>>
>
>     I would be interested to know any of that proprietary solutions.
>     May you indicate me any?
>
>>
>>     __
>>     /*Y.2262 PSTN/ISDN emulation and simulation, Appendix IV
>>     Examples of emulation of PSTN and N-ISDN bearer services
>>     *(This appendix does not form an integral part of this
>>     Recommendation)
>>
>>     Examples for the emulation of PSTN and N-ISDN bearer services are
>>     provided:
>>
>>     1) Monorate bearer services (= 1 × 64-kbit/s digital bearer in
>>     PSTN/ISDN)
>>     . ITU-T Recommendations I.231.2 and I.231.3 may be emulated by a
>>     single RTP
>>     session, with or without RTP control protocol (RTCP), using an
>>     RTP profile according
>>     to IETF RFC 3551.
>>     . ITU-T Recommendation I.231.1 may be emulated by a single RTP
>>     session, with or
>>     without RTCP, using RTP clearmode according to IETF RFC 4040.
>>
>>     2) Multirate bearer services (= N × 64-kbit/s digital bearer in
>>     PSTN/ISDN; N greater than one)
>>     . ITU-T Recommendations I.231.4 to I.231.10 may be emulated by
>>     TDMoIP described
>>     in ITU-T Recommendation Y.1453.
>>
>>     /
>>     > -----Original Message-----
>>     > From: [email protected]
>>     > [mailto:[email protected]] On Behalf Of Javi
>>     > Sent: Samstag, 29. Januar 2011 02:13
>>     > To: [email protected]
>>     > Subject: [Megaco] TDMPW and MeGaCo/SDP
>>     >
>>     > Assuming the next situation:
>>     >
>>     > ISDN Terminal 1  -   MG1 -  [IP network] -  MG2   -   ISDN
>>     Terminal 2
>>     >
>>     > where the MGs (Media Gateway) are controlled by a MGC (Media
>>     Gateway
>>     > Controller) via MeGaCo[H.248.1].
>>     >
>>     > [ITU-T Y.2262 / Annex IV] proposses that MGs may transport
>>     > ISDN B-channels over the IP network:
>>     >
>>     > + By a single RTP session (when monochannels ISDN services)
>>     >
>>     > + Or by TDMoIP (= UDP TDMPWs), when multichannels ISDN services.
>>     >
>>     >
>>     > How may MGC indicate to the MG that it uses PWs at the IP
>>     termination?
>>     >
>>     > It may be done by MeGaCo, using SDP[RFC4566] at Local/Remote
>>     > descriptors. However, how may be that SDP description of TDMPWs?
>>     >
>>     > Thanks,
>>     >
>>     > Javier Muñoz
>>     >
>>     >
>>     > _______________________________________________
>>     > Megaco mailing list
>>     > [email protected]
>>     > https://www.ietf.org/mailman/listinfo/megaco
>>     >
>

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