The following should be verified if the problem happens regularly. <div><br></div><div>Verify QoS is applied end-to-end</div><div><br></div><div>1. Make sure voice gateways classify\police traffic at egress</div><div>
2. Confirm and then reconfirm that your service provider (SP) is applying the correct CoS profile. </div><div>3. Make sure the switches are honoring the DSCP values assigned by phones. <br><div><br></div><div><br>
<br><div class="gmail_quote">On Mon, Jan 30, 2012 at 8:25 AM, Nick Matthews <span dir="ltr"><<a href="mailto:matthnick@gmail.com">matthnick@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Be wary - 'dropped calls' are some of the vaguest problem descriptions.<br>
<br>
Things that classify as a 'dropped call' - one way audio, no way<br>
audio, actual call drop with abnormal cause code, phone failover, lack<br>
of patience in queue, people who have walked away from their phone by<br>
the time it's answered, transfer failures, cell phone drops, and<br>
probably a few more.<br>
<br>
Even then, the one-way/no-way audio can be intermittent, mid call, or<br>
for the whole call. Those are tons of fun.<br>
<br>
Even if you set up a trap for abnormal cause codes it's still likely<br>
users will report call drops you can't monitor, unless you're<br>
currently having call drops and already know you're seeing abnormal<br>
cause codes.<br>
<span class="HOEnZb"><font color="#888888"><br>
-nick<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On Mon, Jan 30, 2012 at 10:48 AM, Dennis Heim <<a href="mailto:Dennis.Heim@cdw.com">Dennis.Heim@cdw.com</a>> wrote:<br>
> I would think it would be more important to monitor call quality. Latency,<br>
> jitter, mos scores. There are some monitoring products out of the box that<br>
> can do this, solarwinds, CUOM/SM. This can also to a degree be accomplished<br>
> with elbow grease and opensouce solutions(Nagios, cacti, pick your poison)..<br>
><br>
><br>
><br>
> Thanks,<br>
><br>
><br>
><br>
> Dennis Heim<br>
> Senior Engineer (Unified Communications)<br>
> CDW Advanced Technology Services<br>
> 10610 9th Place<br>
> Bellevue, WA 98004<br>
><br>
> <a href="tel:425.310.5299" value="+14253105299">425.310.5299</a> Single Number Reach (WA)<br>
><br>
> <a href="tel:317.569.4255" value="+13175694255">317.569.4255</a> Single Number Reach (IN)<br>
> <a href="tel:317.569.4201" value="+13175694201">317.569.4201</a> Fax<br>
> <a href="mailto:dennis.heim@cdw.com">dennis.heim@cdw.com</a><br>
> <a href="http://cdw.com/content/solutions/unified-communications/" target="_blank">cdw.com/content/solutions/unified-communications/</a><br>
><br>
><br>
><br>
> From: <a href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a><br>
> [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a>] On Behalf Of Ryan Ratliff<br>
> Sent: Monday, January 30, 2012 7:07 AM<br>
> To: Robert Schuknecht<br>
> Cc: <a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>
> Subject: Re: [cisco-voip] How to monitor dropped Calls<br>
><br>
><br>
><br>
> You can monitor CDRs for "abnormal" disconnect codes. There's nothing out<br>
> of the box that will do this for you.<br>
><br>
><br>
><br>
> -Ryan<br>
><br>
><br>
><br>
> On Jan 30, 2012, at 9:48 AM, Robert Schuknecht wrote:<br>
><br>
><br>
><br>
> Hi List,<br>
><br>
><br>
><br>
> Is there a way to monitor dropped Calls in a CUCM environment? Our customer<br>
> wants to get informed by RTMT (Perfmon), Networkmanagement (SNMP) Systems or<br>
> E-Mail when dropped Calls are occurring. Especially for IP-Phone to IP-Phone<br>
> and IP-Phone to MGCP-Gateway Calls.<br>
><br>
><br>
><br>
> Any hint is welcome!<br>
><br>
><br>
><br>
> /Robert<br>
><br>
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><br>
><br>
><br>
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