From: Scott M. Livingston (scottl@sprinthosting.net)
Date: Fri Apr 04 2003 - 19:17:09 GMT-3
Thank you for your insight! I will look into this in more detail
tonight.
Thank You,
Scott
-----Original Message-----
From: tan [mailto:tan@dia.janis.or.jp]
Sent: Friday, April 04, 2003 7:14 AM
To: 'Scott M. Livingston'; ccielab@groupstudy.com
Subject: RE: VOICE Feature Questions
I didn't come across anything like that in my reading, but I was not
that
thorough.
conf t
voice-port 0/0/0
blah blah
comfort-noise command <--------1
blah blah
exit
voice-peer .....voip <--------2
blah blah
VAD on/off command <--------3 default on for voip
end
The comfort-noise command is done under the voice port line 1, but is
tied
to the VAD command being enabled under voice-peer line 3. Even if
comfort-noise is on, VAD off would disable it. If you used voip keyword
at
line 2, I don't think IOS would override your commands, but if you used
vofr
keyword instead at line 2, maybe what you told is possible in this
situation. Not quite sure why it would happen, but IOS would at least be
aware of the WAN nature of the voice link. My guess would be it is VAD
that
is off by default on vofr rather than the subset feature comfort-noise
itself being targeted. If you'd like, I could lab it up and test it?
Marc
> -----Original Message-----
> From: Scott M. Livingston [mailto:scottl@sprinthosting.net]
> Sent: Friday, April 04, 2003 8:50 PM
> To: 'tan'; ccielab@groupstudy.com
> Subject: RE: VOICE Feature Questions
>
>
> Thanks for taking the time to explain all of that!!! Riddle
> me this if
> you would be so kind; I was told a few days ago that 'comfort
> noise' is
> not sent over the WAN as it is configured on the local voice port. Is
> it your stance that 'comfort noise' is sent over the WAN? Thanks again
> for all your help!!!
>
> scott
>
> -----Original Message-----
> From: tan [mailto:tan@dia.janis.or.jp]
> Sent: Friday, April 04, 2003 1:54 AM
> To: 'Scott M. Livingston'; ccielab@groupstudy.com
> Subject: RE: VOICE Feature Questions
>
> Scott, I had the same questions about VAD and comfort noise last week.
> The
> confusing part at first was the similarity in the descriptions of
> sending
> packets during times of silence with VAD or comfort-noise ect..
>
> VAD is required to use the comfort-noise feature. Comfort-noise and a
> few
> other features are a subset of VAD. VAD is Voice Activation
> Detector or
> something like that. If you disable VAD, comfort-noise it disabled too
> along
> with the other subset features.
>
> Without VAD, your phone works like a normal analog phone, always
> "sending"
> silent analog signals. So, if conversation has a pause, your router
> still
> collects those empty analog signals, converts silent analog
> to digital,
> packets them and sends off. With VAD and its voice detection
> turned on,
> the
> router detects the silence and turns off the conversation so to speak,
> and
> does not send the analog silent packets.
>
> Next, comfort noise is a subset feature of VAD, the sending
> of a rumble
> to
> give impression of open phone line. The other half of the feature is
> that
> rumble would be annoying during the conversation, so it turns
> itself off
> when speaking starts, and this is where the VAD part is necessary to
> recognize when the speaking starts/stops.
>
> Points...
> VAD off equals same as analog conversation. Continual flow. No extra
> features (like comfort-noise).
> Vad on equals no "packets of silence" on the wire, less bandwidth used
> up,
> traffic on wire is stop and go.
> Comfort-noise equals packets of rumble on wire during silence. More
> bandwidth than with both vad and comfort-noise turned off.
>
> You can also tell when speaking that VAD is on, there is a
> micro second
> delay in reverb back through the ear piece.
> I experimented with comfort-noise, but my stack of routers
> were so loud
> in
> the background it cancelled out any affect. Not to mention trying to
> talk to
> yourself between two phones feels a bit foolish.
>
> M
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
[mailto:nobody@groupstudy.com]On Behalf Of
> Scott M. Livingston
> Sent: Wednesday, April 02, 2003 10:07 PM
> To: ccielab@groupstudy.com
> Subject: VOICE Feature Questions
>
>
> Anyone have any deep dark secrets on when and how best to use the
> following features? I don't have much practical experience in
> this area
> and no VIC's at the house. Basically, I am concerned with gotchya's
> related to these features.
>
> VAD
> COMFORT-NOISE
> MUSIC-THRESHOLD
>
> I understand the following:
>
> VAD: Configured on dial-peer only. On by default. When
> enabled it stops
> the sending of packets during silence. VAD should be enabled
> on low BW
> connections, but disabled for high BW links.
>
> COMFORT-NOISE: Configured on voice ports only. On by default. When
> enabled it is used to send "subtle" background noise during the silent
> periods.
>
> MUSIC-THRESHOLD: Configured on voice ports only. Not on by default???
>
>
> Question: VAD and COMFORT-NOISE seem to contradict one
> another. Or is it
> the fact that COMFORT-NOISE will send far LESS background
> noise compared
> to having VAD disabled? COMFORT-NOISE is just sending enough
> background
> noise to keep the listener on the other end happy in that they know
> someone is still on the line even if they stop speaking.???
>
> Thank You,
> scott
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