interupting the call after clicking on "call"

[yaman]

is the a way to interrupt the call after clicking on "call"?, meaning if you discovered that you made a mistake after you have clicked on "call" by entering the wrong phone number, how can we stop the call from being connected?

it will be nice as well to add to additional fields:

1- "redial", in case you need to redial the same number again
2- "make another call" in case you need to start a new call again.
3- "status" by giving you the current status of the call

you can see how it is done on this page http://www.webcalldirect.com/en/index.php

i guess the same guys with free calls, voipstunt, voipcheap and co,

thanks