Firstly, apologies for the rather vague subject title.
Here is the problem that I need to solve:
I am in the UK
When I have an incoming call from my PSTN (using a TDM400P), the caller hears three rings and then a ‘click’ that might be mistaken for a dropped call or someone bugging the line like it is demonstrated in films. Then there is a 5 to 10 second pause, as though asterisk is thinking. This is then followed by an internal ring out to several extensions in a ring group (US tones here, versus UK ringing tones on the initial ring).
The US rings are need to be changed, but this is not as critical as the wait - callers will thing the line is dead and break the call at the pause.
There is nothing obvious in the asterisk logs.
Please can someone give me a head start in dealing with this problem?