Subject: [Megaco] SDP in H.248

From: Frank Reno <[email-masked]>
Date: Thu, 2 Jun 2005 14:30:11 -0700 (PDT)

Has there been any work to clarify SDP usage in H.248?
 There was a discussion on this topic in March Of
2002, but it appears nothing came out of it.

Specifically:
1. The current specs say:
  -  the use of CHOOSE is allowed in place of a single
parameter value;

Yet there is no definition of what a "single parameter
value" is in either H.248.1 or in RFC 2327.

2. The current specs also say:
  -  the use of alternatives is allowed in place of a
single parameter value.

There is no definition of what the syntax is for
"alternatives" in SDP.  There is a definition of
"alternatives" for H.248 ABNF, but it is unclear if
this syntax is intended for SDP "alternatives".  Also,
it is not clear whether such a syntax would conflict
with the SDP syntax, since again it is unclear what a
"single parameter value" is.

3. It is clear from examples and current practice that
hyphens should be used to indicate irrelevant but
required parameters, but H.248 is silent on the
subject.   It appears that not every parameter that
might be set to hyphen can accept hyphen according to
RFC2327 and like CHOOSE the SDP syntax actually needs
modification.

thanks,
frank

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