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<DIV><FONT face=Arial size=2>What happens on calls to my H.323 PBX gateway,
where I believe the VAD is 'enabled' by default?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Do you have a link to describe the difference in
G.729, G.729a, G.729ab?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is there any other option to improve or obtain the
best quality on the G.729 codec?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Bob</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=kthorngr@cisco.com href="mailto:kthorngr@cisco.com">Kevin
Thorngren</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=bababooey@cox.net
href="mailto:bababooey@cox.net">Bob A. Bowie</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=cisco-voip@puck.nether.net
href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, January 11, 2006 11:05
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [cisco-voip]
Cm4.1-G729-VAD</DIV>
<DIV><BR></DIV>You will want to look at these CallManager Service
Parameters:<BR><BR>Silence Suppression : This parameter determines whether
silence suppression is utilized. Valid values specify True (silence
suppression is enabled for all devices) or False (silence suppression is
disabled). <BR>This is a required field.<BR>Default: false.<BR><BR>Silence
Suppression for Gateways : This parameter determines whether silence
suppression for gateways is utilized. Valid values specify True (enable
silence suppression for all devices on gateways) or False (disable silence
suppression). <BR>This is a required field.<BR>Default: false.<BR><BR>Strip
G.729 Annex B (Silence Suppression) from Capabilities : THIS PARAMETER MUST BE
SET TO THE SAME VALUE ON EVERY NODE IN THE CLUSTER. This parameter determines
whether the system will advertise or negotiate Annex B for G.729 codecs. Valid
values specify True or False. If the parameter is set to True, the system will
not advertise or negotiate Annex B for G.729 codecs, unless that is the only
matching codec (G.729b or G.729ab). Annex B provides silence suppression. If
you are using a device that only advertises G.729b and/or G.729ab, the
potential exists for the call to fail due to a capabilities mismatch. If the
system can detect the mismatch, it will try to connect the call with Annex B
anyway; however, if the call involves an intercluster trunk, this may not be
possible, and a transcoder may be allocated, or the call may fail. As the
solution, reconfigure the device to support other capabilities (such as G.729
or G.729a) if possible. Also, remember that this service parameter works
independently from the other systemwide parameters Silence Suppression and
Silence Suppression for Gateways. Those parameters only determine whether
silence suppression is enabled in Skinny (SCCP) and MGCP, but this setting
does not affect the capabilities negotiation. Some devices will override the
value of this parameter on the basis of the negotiated capability. <BR>This is
a required field.<BR>Default: false <BR><BR>Kevin<BR>On Jan 11, 2006, at 10:07
PM, Bob A. Bowie wrote:<BR><BR>
<BLOCKQUOTE><?fontfamily><?param Arial><?smaller>Is vad enabled when I use
G.729 for the codec on the Call manager?<?/smaller><?/fontfamily><BR><?fontfamily><?param Arial><?smaller>If
so, is there a way to diable it as on the
router?<?/smaller><?/fontfamily><BR> <BR><?fontfamily><?param Arial><?smaller>Thanks,<?/smaller><?/fontfamily><BR><?fontfamily><?param Arial><?smaller>B<?/smaller><?/fontfamily>_______________________________________________<BR>cisco-voip
mailing
list<BR>cisco-voip@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/cisco-voip<BR></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>