Asterisk voice changer from Male to Female

Hello All

Pleas any one support me for this application where If user calls to B party then voice can change from Male to Female, Female to mail and other funny voices.

I used PITCH function but its not working for Male to Female

There is no application built in which explicitly does this.

Any external application which can sync up with asterisk?

I have no knowledge of that. Perhaps someone else does.

Please anyone who can help me on this?