Hi! A while ago now, did you found what you wanted? We're just finishing an Ionic app (hybrid/native for iOS, Android, web etc) for use with our hosted Kazoo platform. For now it can handle the basic user functions (CDRs, login/ out of ring groups, call forward etc), but also a function to dial from mobile through the PBX (calltrhu or callback) and push notifications (get a notice before your mobile is ringing, showing who's calling and where, before you answer). We've also develo