Sip Dialer For Android and symbian Mobile

i need a sip account login dialer for useing voip Feature>> login account dial pad call History contacts Setting i Am useing VoipSwitch and asterisk Switch but i problem too many country have sip block like KSA,UAE,Bangladesh,PAK so need solution or byte server for useing this Dialer For blockage country Customer need good Quality in LOW Bandwith so we want to use g729 codec Dialer Grap if user Download this Dialer any mobile 1St steep : please enter operator code (like our operator code is 1010 and our SIP server ip is [login to view URL]) now if user type operator code 1010 user will forward this IP:[login to view URL] 2nd steep:user and password (if user provied valid user pass they will registerd with this server [login to view URL] and show Blance 3rd steep: when user in call they can see call time,hold call,mute,Loudspeaker and handset mode need A web base portal for manage operator code operator code must be added with : Name|email ID|registerd date-expire date|Sip serverIP|SIP Port|Payement have to store all changes like if we change any SIP IP or port payement history all info if You want to use a aditional server for save IP blockage You can use i think if possibale to use a proxy server then any ware did not block our SIP ips may be If you have any smart idea tell us