RE: [Megaco] RE: Silence Suppression

[Carl Rutter <[e-mail]>]

Thx,
 
That would do.
I still kind of liked
the silenceSupp attribute because it
is more flexible.
 
Carl
 

-----Original Message-----
From: David Barr [mailto:[e-mail]]
Sent: Friday, March 15, 2002 11:05 AM
To: Tom-PT Taylor; 'Carl Rutter'; Shambhu Dayal Rai
Cc: 'Safa Mohammad'; [e-mail]
Subject: 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'; [e-mail] 
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:[e-mail] <mailto:[e-mail]> ] 
Sent: Friday, March 15, 2002 10:28 AM 
To: Taylor, Tom-PT [CAR:B800:EXCH]; Shambhu Dayal Rai 
Cc: 'Safa Mohammad'; [e-mail] 
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:[e-mail]
<mailto:[e-mail]> ] 
Sent: Tuesday, February 12, 2002 3:00 AM 
To: Shambhu Dayal Rai 
Cc: 'Safa Mohammad'; [e-mail] 
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:[e-mail] <mailto:[e-mail]>
] 
Sent: Monday, February 11, 2002 5:22 AM 
To: Taylor, Tom-PT [CAR:B800:EXCH] 
Cc: 'Safa Mohammad'; [e-mail] 
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:[e-mail]
<mailto:[e-mail]> ] 
> Sent: Saturday, February 09, 2002 12:28 AM 
> To: [e-mail] 
> Subject: [Megaco] Silence Suppression 
> 
> Hi, 
> 
> How to specify SS when using ABNF encoding? 
> 
> Thanks, 
> 
> Safa 
> 
> _______________________________________________ 
> Megaco mailing list 
> [e-mail] 
> https://www1.ietf.org/mailman/listinfo/megaco
<https://www1.ietf.org/mailman/listinfo/megaco>  

-- 
------------------------------------------------------------------- 
Shambhu Dayal Rai                              [e-mail] 
Infosys - India SQA Team              91-80-8520362 Ext. : 6561 
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