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Re: [codec] #14: VAD and CNG?

Michael Knappe <mknappe@juniper.net> Mon, 24 May 2010 16:12 UTC

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From: Michael Knappe <mknappe@juniper.net>
To: Brian Rosen <br@brianrosen.net>, "Olle E. Johansson" <oej@edvina.net>
Date: Mon, 24 May 2010 09:09:43 -0700
Thread-Topic: [codec] #14: VAD and CNG?
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Subject: Re: [codec] #14: VAD and CNG?
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Not to mention any possibility of chopping off a portion of a syllable here
or there...

Mike


On 5/24/10 8:53 AM, "Brian Rosen" <br@brianrosen.net> wrote:

> When you make an emergency call, background is a very important source of
> information.  For example, if the call taker hears someone threaten the
> caller, that will inform the response.  Often the caller is in distress, and
> may put the phone down, or speak faintly.  VAD will "zero out" the
> background sounds.
> 
> Brian
> 
> 
> On 5/24/10 11:30 AM, "Olle E. Johansson" <oej@edvina.net> wrote:
> 
>> 
>> 24 maj 2010 kl. 16.48 skrev Brian Rosen:
>> 
>>> I hope we are assuming VAD (or DTX) is negotiable.  It is essential (for
>>> emergency calls) that VAD is disabled.  While in many cases the endpoint
>>> will know that it is in an emergency call, and disable VAD, it is not always
>>> possible to know.
>> 
>> 
>> Just for curiosity, Brian. Why is it essential for emergency calls to disable
>> VAD?
>> 
>> /O
>> 
>> 
> 
> 
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