question
 

When I pick up the phone, if I am a little slow to dial, it right away go to busy signal.

Is there any way to delay the signal?

Maybe the "No-Key" Entry timeout is set too low?
I like to keep mine at 10 seconds.
I usually press the send button, or the "#" key at the end of number string, so this setting does not introduce extra delays when making a call.

Thanks kurun. Can you tell me where I could set the "NO-Key" ? And what I means is before enter the phone number, I pick up the phone, I have to right away dial it, or it will go to the busy tone. How could I make the normal tone longer?

on a Sipura/Linksys it is called "Interdigit Short Timer" under the Regional tab, default is three seconds only; some people might find it more useful to have a longer time set

It works. thanks ctylor.