Why use two different "H.248 mechanisms" in H.323?

Frank Derks frank.derks at PHILIPS.COM
Wed May 30 03:24:00 EDT 2001

There are two ways in which H.248 can be used in H.323. One way is through
Annex L Stimulus Signalling, which basically "tunnels" H.248 messages in
H.225.0 Call Signalling Messages (although Annex L only speaks about "commands",
I assume that "replies" may also be carried).

Another way of carrying H.248 is through the serviceControlSession element,
which can be transported in most of the Call Signalling messages and some of
the RAS messages. Using this mechanism, however, introduces a limitation in
that only H.248 _signals_ may be transported.

If the idea behind the second approach is to have a "lightweight" way of using
only some of H.248's functionality, then I wonder why H.248 _events_ were not
included as part of the solution.



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