[cisco-voip] Odd one-way/no audio issues with just one user

[Nick Matthews]

I've seen similar things if there is an IP conflict or some type of
mac-flapping.  Duplicate IP addresses have been called many things.
Sometimes MTPs do odd things like this. Don't think those apply here.

Sometimes it's a race condition - maybe that user is really speedy with how
the call gets answered, and isn't a typical use case.

Alternatively, it could be a DSP issue. Certain DSP channels can go bad,
and if that particular user is the most-called at the site they may stay on
the low channels more often than other users.

Just because only one user is reporting it, doesn't mean they're the only
user. There was one problem where the problem was reported heavily, then it
went down, and only 1 or 2 users had problems. What happened is the other
users got frustrated with reporting and just stopped, but people thought
the problem had gotten better.

Just some ideas.

-nick



On Tue, Sep 17, 2013 at 5:13 PM, Erick Wellnitz <ewellnitzvoip at gmail.com>wrote:

> Perhaps the other end is on mute?  I know I've been talking away while on
> mute only to discover my error many minutes later.  Maybe the ecall is on
> hold and MOH is silence?
>
>
>
>
> On Tue, Sep 17, 2013 at 3:19 PM, Norton, Mike <mikenorton at pwsd76.ab.ca>wrote:
>
>>  Maybe this is too obvious, but... are you sure the outside caller is
>> saying anything? Maybe this one user has gotten their number on some
>> spammer’s list and they are receiving dead-air calls from an
>> autodialer/fax/etc.****
>>
>> ** **
>>
>> -mn****
>>
>> ** **
>>
>> ** **
>>
>> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] *On
>> Behalf Of *Erick B.
>> *Sent:* September-17-13 12:45 PM
>> *To:* Ryan Ratliff (rratliff)
>> *Cc:* voip puck
>> *Subject:* Re: [cisco-voip] Odd one-way/no audio issues with just one
>> user****
>>
>> ** **
>>
>> A packet capture from the phone shows the RTP stream with no audio. The
>> operator gets calls from all locations though so the problem calls come in
>> multiple PRIs and not just one so can't pinpoint it to a particular gateway
>> / PRI issue. A majority of the calls do come in the same gateway though and
>> the PRI is clean (no errors). Let me look through the CMR records for some
>> problem calls. I do have a TAC case on this also. Just looking for some
>> more ideas as I've tried almost everything and this is pretty odd. ****
>>
>> ** **
>>
>> On Tue, Sep 17, 2013 at 1:09 PM, Ryan Ratliff (rratliff) <
>> rratliff at cisco.com> wrote:****
>>
>> What do the CMR records say about those calls?
>>
>> -Ryan****
>>
>>
>> On Sep 17, 2013, at 12:51 PM, Erick B. <erickbee at gmail.com> wrote:
>>
>> Hi,
>>
>> Anyone have any ideas on this?
>>
>> Older system, CUCM 6.1.1a (no SUs) that has been running fine for years
>> and past 2-3 months only one user is having problems with no audio or one
>> way audio on calls. The IP Phone user can't hear the outside caller.
>> External calls have issue mostly. Problem happens 1-2 times a day.
>>
>> We have replaced the 7962 phone, headset, put it in another switch port.
>> Updated firmware to 8.5.2 (latest compatibile with 6.1 per docs). I have
>> updated the IOS on the MGCP voice gateway from 12.4(15)T4 to 12.4(15)T17
>> and that fixed a duplicate DTMF issue (user was hearing DTMF tones on some
>> calls) and also seemed to help the problem calls as there are less since
>> the IOS upgrade but still 2-3 a day compared to a dozen or so before the
>> IOS upgrade.
>>
>> I haven't been able to duplicate the issue with several hundred calls in,
>> it is very sporadic.
>>
>> I know the CCM version is old, thinking about applying latest SUs for 6.1
>> until the client can update to newer hardware. Just strange only one user
>> having this problem. We checked around several times.****
>>
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip****
>>
>> ** **
>>
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>>
>>
>
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