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