[cisco-voip] What could cause a "buzzing" rather than call progress tones?

[Peter Slow]

Out of curiosity, what's the pitch of the buzzing? High? low? does it
happen to sound like 60hz?
Last time someone I knew had this problem, they had run a telephone
line past/draped over an AC power cable and were hearing a buzzing
noise caused by induction.
How neat is your wiring? =) do you have any cables related to this
call bundled alongside any highly energized wiring like a power cable?
does the buzzing really stop after the call is answered or does it
just become inaudible against background noise?
Just a shot in the dark, I wouldn't think this kind of thing could
possibly affect a digital circuit, but perhaps its affecting a piece
of hardware... or perhaps the wiring is near the handset/headset?

What is the actual device the buzzing noise is heard/observed on?
If no alerting tone is heard at all, the device responsible for
playing it is likely to be at fault.
Obtaining CCM traces as Ryan was mentioning will help you figure out
what device that it.

-Peter


On Wed, Jan 21, 2009 at 5:16 PM, Jason Burns <burns.jason at gmail.com> wrote:
> If the ringback sounds particularly awful check for a companding type
> mismatch. Is one side doing 711ulaw and the other 711alaw?
>
> On Wed, Jan 21, 2009 at 10:33 AM, Robert Kulagowski <rkulagow at gmail.com>
> wrote:
>>
>> James Edmondson wrote:
>>>
>>> I had a smiliar issue awhile back and it ended up being and ios issue.
>>> We heard buzzing instead of ringback.  However it was a H323 vgw not
>>> mgcp. What ios are you running?
>>
>> 12.4(15)T1
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