We have a few deployments in the field that are complaining that when a second call comes in and the user is already engaged in another call, there is no alert tone either on the speaker or handset. The only way the user knows there is another call is if they happen to be looking at the telset at the time the call comes in to notice it. Obvoulsy, this will cause missed calls.
The thing is, this doesn't happen at all of our locations, only a handfull (perhaps 3-4 are complainging out of 70 deployments).
I've tried duplicating this in our labe enviroment with different firmware revisions and in each case it works for us.
Is there a setting or other procedure to bring back the alert tone?