RE: [Megaco] RE: Silence Suppression

Another possibility is to use payload 13 as defined in
draft-ietf-avt-rtp-cn-05.  E.g.:

Media={Stream=1{ Local {
v=0
c=IN IP4 $
m=audio $ RTP/AVP 0 13
}}}

-----Original Message-----
From: Taylor, Tom-PT [CAR:B800:EXCH] 
Sent: Friday, March 15, 2002 3:32 PM
To: 'Carl Rutter'; Shambhu Dayal Rai
Cc: 'Safa Mohammad'; megaco@ietf.org
Subject: [Megaco] RE: Silence Suppression

I'm starting to think that the answer may be to use the a=silenceSupp
attribute defined in RFC 3108, section 5.6.3.2.

-----Original Message-----
From: Carl Rutter [mailto:crutter@telica.com]
Sent: Friday, March 15, 2002 10:28 AM
To: Taylor, Tom-PT [CAR:B800:EXCH]; Shambhu Dayal Rai
Cc: 'Safa Mohammad'; megaco@ietf.org
Subject: Silence Suppression

Question on Silent Suppression,

draft-ietf-avt-rtp-mime-06.txt doesn't specify 
an annexa or annexb parameter for PCMU or PCMA
so if we wanted to do PCMU or PCMA with silent suppression
what would we specify?

Thx,
Carl

-----Original Message-----
From: Tom-PT Taylor [mailto:taylor@nortelnetworks.com]
Sent: Tuesday, February 12, 2002 3:00 AM
To: Shambhu Dayal Rai
Cc: 'Safa Mohammad'; megaco@ietf.org
Subject: RE: [Megaco] Silence Suppression

You're right: I was careless.  As a matter of fact, silence suppression is
an attribute of the payload type.  draft-ietf-avt-profile-new-xx.txt
indicates that you include payload type-specific parameters in an a=fmtp:
line.  You get such parameters from the payload specification document.  The
MIME type registration document draft-ietf-avt-rtp-mime-xx.txt summarizes
the parameters available for the payloads it registers.  To get silence
suppression for the payload type G729D, for instance, you include the annexb
parameter with a value "yes" (which is actually the default).  Thus Local or
Remote looks like:

Media={Stream=1{ Local {
v=0
c=IN IP4 $
m=audio $ RTP/AVP 96
a=rtmap:96 G729D
a=fmtp:96 annexb=yes
}}}

-----Original Message-----
From: Shambhu Dayal Rai [mailto:sdrai@lucent.com]
Sent: Monday, February 11, 2002 5:22 AM
To: Taylor, Tom-PT [CAR:B800:EXCH]
Cc: 'Safa Mohammad'; megaco@ietf.org
Subject: Re: [Megaco] Silence Suppression

I guess Safa is asking about Silence suppression not echo cancelation.

I feel silence suppression can be specified in the SDP of Local or Remote
descriptors something like..

Media={Stream=1{ Local {
v=0
c=IN IP4 $
m=audio $ RTP/AVP 0
a=SilenceSupp:on
}}}

-Shambhu

> Tom-PT Taylor wrote:
> 
> As per Annex E.13, you set the property in the LocalControl descriptor of
the audio stream involved:
> 
>       ...Media={Stream=1{LocalControl={...,tdmc/ec=on,...
> 
> -----Original Message-----
> From: Safa Mohammad [mailto:Safa.Mohammad@mail.sc.netergymicro.com]
> Sent: Saturday, February 09, 2002 12:28 AM
> To: megaco@ietf.org
> Subject: [Megaco] Silence Suppression
> 
> Hi,
> 
> How to specify SS when using ABNF encoding?
> 
> Thanks,
> 
> Safa
> 
> _______________________________________________
> Megaco mailing list
> Megaco@ietf.org
> https://www1.ietf.org/mailman/listinfo/megaco

-- 
-------------------------------------------------------------------
Shambhu Dayal Rai                              sdrai@lucent.com 
Infosys - India SQA Team              91-80-8520362 Ext. : 6561
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