Can't call.continuous tone at the phone when i try to make a call

Check the dial pad keys for a stuck button, if it has a hanset with its own dial pad check it as well.

If you can not locate it, try listening on the line and pushing the dail keys one at a time. you should now hear dual tomes, the one you are causing and the offending tone, when you hit the offending key there will onlt be a single tone as this button is already sounding off.Do not forgrt the special keys(# &*)

Hope this is of some help.
Ed