[cisco-voip] MOH Beeping

[Wes Sisk]

For the benefit of the list.  Nice diagnosis by Kevin -

"I added a ground loop isolator to the input of the card and the noise 
has been eliminated."

/Wes


On Wednesday, February 03, 2010 10:40:48 AM, Peter Slow 
<peter.slow at gmail.com> wrote:
> Touching on what Mike and Wes said, to test the interference idea...
> I'm guessing you tried plugging the USB audio device into your laptop
> at your desk or some place other than the rack. Can we see if you hear
> the beeping if we put your laptop on top of the MCS server in the rack
> and try it there? if it's RF interference it'll have to do with your
> proximity to the device generating the RF noise.
>
> -Peter
>
> On Tue, Feb 2, 2010 at 6:54 PM, Kevin Dunn <cheesevoice at gmail.com> wrote:
>   
>> I will give it a shot
>>
>> Thanks Les
>>
>> On Tue, Feb 2, 2010 at 5:37 PM, Wes Sisk <wsisk at cisco.com> wrote:
>>     
>>> Thanks Kevin,
>>>
>>> So:
>>> noise is not present recording from USB source to your laptop.
>>> noise is present even in the packets transmitted over the wire to the
>>> phone when USB device is connected to server.
>>>
>>> Based on the nature of sound I agree with Mike that it sounds like
>>> electrical interference.  Are the server and rack grounded?  When you
>>> captured "good.au" what source of power and and ground was your laptop
>>> using?
>>>
>>> Do you have another analog source such as an iPod or mp3 player that would
>>> use a different, or possibly floating ground, to test with?
>>>
>>> You have eliminated most of the devices in the audio path. The only way to
>>> isolate further inside the server is to use a root account to dump audio
>>> directly off the linux DSP device before the IPVMSApp kernel driver attempts
>>> to packetize it for transmission over the network.  If noise is present in
>>> that sample then it is either introduced by electrical interface between the
>>> source and USB device or introduced in the USB device itself.
>>>
>>> /Wes
>>>
>>>
>>> On Tuesday, February 02, 2010 5:17:53 PM, Norton, Mike
>>> <mikenorton at pwsd76.ab.ca> wrote:
>>>
>>> Listening to the capture, it sounds like ambient electrical/RF noise is
>>> getting into the analog audio signal. I’m surprised this isn’t a more common
>>> problem. Server racks are probably one of the least ideal places to try to
>>> run unbalanced analog audio signals.
>>>
>>>
>>>
>>> --
>>>
>>> Mike Norton
>>>
>>> I.T. Support
>>>
>>> Peace Wapiti School Division No. 76
>>>
>>> Helpdesk: 780-831-3080
>>>
>>> Direct: 780-831-3076
>>>
>>>
>>>
>>>
>>>
>>> From: cisco-voip-bounces at puck.nether.net
>>> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Kevin Dunn
>>> Sent: February-02-10 1:30 PM
>>> To: Wes Sisk
>>> Cc: Cisco Voice
>>> Subject: Re: [cisco-voip] MOH Beeping
>>>
>>>
>>>
>>> Sev3 SR 613458017 Udhay has been pretty helpful so far checking the
>>> configuration.
>>>
>>> the sniff files are associated with that case,m you should be able to see
>>> them (otherwise I can add them in)
>>>
>>>
>>>
>>> User experience:
>>>
>>>
>>>
>>> I call my boss, he answers by pressing speaker button.
>>>
>>> I place him on hold
>>>
>>> He hears the "good.au" sound I enclosed for Peter to listen to
>>>
>>>
>>>
>>> the sound is not unlike rapid repeated whistling...
>>>
>>> I should note that when I use the handset I don't hear it, but when I
>>> capture the packets it is still there, just not as loud
>>>
>>>
>>>
>>> Kevin
>>>
>>> On Tue, Feb 2, 2010 at 2:07 PM, Wes Sisk <wsisk at cisco.com> wrote:
>>>
>>> In the very abstract this sounds like call waiting tone.  Can you clarify
>>> exactly what the user is doing when "caller is placed on hold and the
>>> speaker is activated"?  What buttons is the user pressing to accomplish
>>> this?
>>>
>>> concurrent detailed CCM and SDL traces and a packet capture of all traffic
>>> to/from the phone could be used to isolate the source of this tone rather
>>> quickly.  You mention a TAC case, what is the number?
>>>
>>> /Wes
>>>
>>>
>>>
>>> On Tuesday, February 02, 2010 12:53:17 PM, Kevin Dunn
>>> <cheesevoice at gmail.com> wrote:
>>>
>>> Okay I have a TAC case open and I have tried changing configuration
>>> settings, cables and hardware...
>>>
>>>
>>>
>>> CUCM 7.0.2.2000-5
>>>
>>> Fixed audio from XM radio (MOH-USB-AUDIO) card
>>>
>>>
>>>
>>> when a caller is placed on hold and the speaker is activated there is an
>>> audible (and quite annoying) beeping sound playing over the top of the audio
>>> file.
>>>
>>>
>>>
>>> It is not audible on the handset or headset.
>>>
>>>
>>>
>>> If I sniff the phone port and capture the audio file I can hear it.
>>>
>>>
>>>
>>> If I record the audio file with my laptop (plugging mic cord into lappy
>>> instead of MOH-USB) there is no beeping.
>>>
>>> In my mind that eliminates the XM radio and cables, I have changed out
>>> cables though, just in case.
>>>
>>>
>>>
>>> I changes out MOH-USB cards and that also did nothing to eliminate the
>>> issue.
>>>
>>>
>>>
>>> I have upgraded firmware on the phones and that wasn't it either.
>>>
>>> With the Sample Audio file (which is JAZZY) there is no beeping regardless
>>> of handset or speaker.
>>>
>>>
>>>
>>> Any suggestions?
>>>
>>> ________________________________
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>>
>>> cisco-voip mailing list
>>>
>>> cisco-voip at puck.nether.net
>>>
>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> _______________________________________________
>>> cisco-voip mailing list
>>> cisco-voip at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>
>>>       
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>>
>>