My set-up is one like this:
Ip phones are registered to a cisco callmanager,an H3.23 gateway is also registered to the same callmanager-the gateway is a cisco 2821 cisco router-which has a number of FXO ports where the pstn providers have terminated their links.
Now the problem is that whenever one wants to call out to the PSTN there is a certain noise(doooooh)that comes from the phone when you finish inputing the numbers-at this stage the call shows up as connected on the screen of the phone.
The other thing is this does not happen all the times-sometimes the call is successful,but of late all am getting is the doooooh sound-i have tried all manner of configs/research without any success.
Please find the running configs of the voice gateway attached.