G4 Webswitch dial tone detect problem

Hi all,

I am using to Webswitch G4 in UK , it was working fine as an FXO , until I update the telephone line to an adsl line. Now I had to add an adsl filter and then connect phone.

By doing so , now when I get a dial tone and then dial 4000 as extension. Webswitch does not seems to reconize the fact that I am pressing button on phone and still continue to give a normal dialtone.

I took out the filter and connect G4 directly , and it works fine. So I think issue is the fact the difference in some settings when its is using thru adsl filter. I just wanted to know if someone has dealt with this issue ?

I have to use the filter as I have one line for adsl as well as trunk line.

Any help would be helpfull , is there any setting specific to UK dialtone that I can change ?

Cheers.
Phil