Beep over speakerphone at the end of a call

[dfleschute]

I must unfortunately use the word "Random".  A growing number of users report a loud beep emitting from their phones at the end of a call.  Yes, it happens randomly.  I have tried to link it to a specific phone number, supervisors monitoring, apparitions floating about.....but to no avail.  It does not happen only to Agents or users of headsets.  Does this sound familiar to anyone?  I have not yet tried a reboot of the PBX.

[DND ON]

Does the display show anything while this is happening?

[dfleschute]

No, but I wouldn't be surprised if no one was watching the display.  Would any of the logs show this information?

[DND ON]

Not that I can think of off the top of my head, but error tones are usually accompanied by an indication on the phone display.

[ralph]

I wonder if the carrier is the source of the tone.
Try this: 
1-have someone call in.  Then have them hang up before you do.   If you have inbound toll free numbers try them also.
2-Call out bound.  Have the far end hang up before you do.

Ralph

[dfleschute]

Failure.  I cannot reproduce the issue, and it is happening once or twice a day.  I have let the users know to watch the display if their phones beep again.

[NTEDave]

Are these new style Digital handsets 8528 or 8568?

I'm sure there was an issue with beeps coming from the handset on a certain version of Firmware and these handsets.

[dfleschute]

These are all 8622Ps.