[cisco-voip] MOH Beeping

[Wes Sisk]

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 
> <mailto: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> <mailto: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?
>
>     ------------------------------------------------------------------------
>
>
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>
>      
>
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