how to invoke a 3rd party dialer instead of native dialer

Hi members,
Is it possible to invoke our own 3rd party dialer instead of the iphone's native dialer during an incoming call in iPhone 4? If yes, how can it be achieved?

Thanks in advance,
Ajit Nadig

It is possible but you will need to Jailbreak. I've not done it myself so can't tell you what the installer package is called so may be a question you should put on the Jailbrek forum

ok thanks for your suggestion.