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<DIV><FONT face=Arial size=2>Cisco CallManager >
RegisteredHardwarePhones</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=MillerS@DicksteinShapiro.COM
href="mailto:MillerS@DicksteinShapiro.COM">Miller, Steve</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</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> Thursday, March 08, 2007 8:31
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [cisco-voip] Perfmon
Commands?</DIV>
<DIV><BR></DIV>Does anyone know what Perfmon command will tell you how many
registered<BR>phones are in your system? Thank you!<BR><BR><BR>Steve
Miller<BR>Telecom Engineer<BR>Dickstein Shapiro LLP<BR>1825 Eye Street NW |
Washington, DC 20006<BR>Tel (202) 420-3370 Fax (202)-330-5607<BR><A
href="mailto:millers@dicksteinshapiro.com">millers@dicksteinshapiro.com</A>
<BR><BR><BR>-----Original Message-----<BR>From: <A
href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</A><BR>[mailto:cisco-voip-bounces@puck.nether.net]
On Behalf Of J. Oquendo<BR>Sent: Thursday, March 08, 2007 4:57 PM<BR>To:
Patrick Diener; <A
href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</A><BR>Subject:
Re: [cisco-voip] Jitter Question<BR><BR>Patrick Diener wrote:<BR>> bottom
line: jitter level should not be greater than 30 - 35ms...<BR>>
unfortunately on a quick search on cisco.com I could not find any
docu<BR><BR>> to back that value...<BR>> <BR>I don't know
where you got the 30-35ms range from so I quote again from<BR>the DQoS
book:<BR><BR>As per:<BR><BR>Cisco DQOS Exam Certification Guide<BR>Wendell
Odom and Michael J. Cavanaugh<BR>Copyright (c) 2004 Cisco Systems,
Inc.<BR><BR><BR>ONE WAY DELAY BUDGET GUIDELINES<BR>*1-Way Delay (in ms)
Description*<BR>0-150 ITU G.114's recommended acceptable range 0-200 Cisco's
recommended<BR>acceptable range 150-400 ITU G.114's recommended range for
degraded<BR>service<BR>400+ ITU G.114's range of unacceptable delay in all
cases<BR><BR>Some flows tolerate loss better than others do. For instance, the
human<BR>ear can detect loss of only 10 ms of voice, but the listener
can<BR>generally understand speech with such small loss. Cisco digital
signal<BR>processors (DSPs) can predict the contents of lost voice packets, up
to<BR>30 ms when using the G.729 codec.<BR><BR>Lost voice packets result in
the receiver having a period of silence<BR>corresponding the length of voice
payload inside the lost packet(s).<BR>With two consecutive<BR>G.729
packets<BR>lost, 40 ms of voice is lost; the G.729 codec cannot predict
and<BR>generate replacement signals when more than 30 ms of consecutive
voice<BR>is lost. A single lost<BR>G.729 packet<BR>would only cause a 20-ms
break in the voice, which could be regenerated.<BR><BR>So, a single<BR>lost
packet is not perceived as loss in a G.729 call.<BR><BR>No luck searching
through the book on 35 ms or 35ms so I tried 40 ms &<BR>40ms:<BR><BR>Page
862<BR>Instantaneous buffer overrun occurs when a switch port TX queue
fills<BR>for an instant causing packet loss, which can adversely affect
real-time<BR>applications. <BR>In a VoIP<BR>conversation, for example, 40 ms
of congestion causes an audible clip in<BR>the conversation.<BR><BR>Page
82<BR>In Figure 1-23, the playout begins at the statically set playout
delay<BR>interval-40 ms in this case-regardless of the arrival time of
other<BR>packets. A 40-ms de-jitter playout delay allows jitter to
occur-because<BR>we all know that jitter happens-so that the played-out voice
can<BR>continue at a constant
rate.<BR><BR><BR>--<BR>====================================================<BR>J.
Oquendo<BR><A
href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743">http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743</A><BR>sil
. infiltrated @ net <A
href="http://www.infiltrated.net">http://www.infiltrated.net</A> <BR><BR>The
happiness of society is the end of government.<BR>John
Adams<BR><BR><BR>--------------------------------------------------------<BR>This
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