asterisks SIP dialer - Repost - open to bidding

I am looking for code for my trixbox Asterisk PBX to dial up to one number, but use multiple times until one answers. IE when dialling a competition line and you need better chances to get through. I would like to make multiple SIP calls simultaneously either from one PBX or use multiple PBX’s to make more channels to call from. If a call is answered we need to be connected to call. I am looking for a mobile app that can be configured to select the X number of simultaneous calls to s single destination. The app will back end to an asterisk PBX.