Transfer time after # is pressed

I’ve set up an extension that calls my cell phone (Dial(etc.,30,tm)). The call connects to my cell and when I press the # key it says to enter the extension to transfer to. The only problem is that it gives me a dial-tone to enter the new extension for only about 2 or 3 seconds, then it connects me back with the person I was talking with before I pressed the # key. Is there a way to extend this period to enter the extension? And is there a way that if no transfer is entered to park it?