Subject: [MMUSIC] RE: [Megaco] Silence Suppression Attribute

From: Dan Elbert <[email-masked]>
Date: Thu, 04 Apr 2002 10:16:50 +0300

I think is a good idea
By the way, if an attribute is registred for use in SDP I don't think there
is a scope limitation, anybody can effectively use it.

Dan Elbert
RADVISION

-----Original Message-----
From: Tom-PT Taylor [mailto:[email-masked]]
Sent: Wednesday, April 03, 2002 12:11 AM
To: [email-masked]; [email-masked]'
Subject: [Megaco] Silence Suppression Attribute

The issue of how to signal silence suppression capability keeps coming up on
the Megaco list.  The situation is fairly complicated:
 - some codecs come with a pre-defined capability for silence suppression.
This capability can be invoked by the appropriate MIME type parameter as
defined in draft-ietf-avt-rtp-mime-06.txt.  That draft is specific to RTP
transport, arguably over UDP only.
 - other codecs like G.711 have no such parameter, yet silence suppression
is possible
 - RFC 3108 defined an a=silenceSupp attribute, but it applies to ATM
transport only.

How would people feel about allowing the a=silenceSupp parameter to be used
independently of the transport type?

Tom Taylor
[email-masked]
Ph. +1 613 736 0961 (ESN 396 1490)

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