Just got a new 124i system. Home I made a smart choice (let me know your thoughts).

Here's a few things I'm having trouble with:

1. We have a T1. I get caller ID coming in, but I'm not sending. Seems to be set to work according to the manual.
2. Can we change the internal dial tone? It sounds too much like the outside dial tone. I'd like a beeeeeeep, not a dial tone sound.
3. Can I have the voice mail back up more than about 2 seconds when we hit 2 (backup). I'd like to backup about 5-6 seconds while listnening to a message.
Thanks.
Mike