Online Phone

Hi, I need an online VOIP phone software for online phone system for users to subscribe, download and then be authenticated into our server and use our VOIP system to have phone to other software users as well as calling to any phone world wide. ## Deliverables The program should support the following: 1-? ? ? ? ? SIP & IAX2 SUPPORT 2-? ? ? ? ? L2TP & PPTP & Open VPN SUPPORT 3-? ? ? ? ? CODEC G723 , G729 , G711, … SUPPORT 4-? ? ? ? ? Asterisk Support 5-? ? ? ? ? Advertisement Menu like yahoo & msn to be feed from the website. 6-? ? ? ? ? Auto update. 7-? ? ? ? ? It must have high quality and very nice graphic design for client interface. 8-? ? ? ? ? Using SIP for authentication 9-? ? ? ? ? Containing phone book. 10-? ? Ability to transfer to anther user 11-? ? Ability of having conference call 12-? ? Also software should be able to check if the connection is open or block by some ISPs in case of blocking it should use different way to connect for example if it can connect directly do so other wise try to use L2TP VPN, in case of L2TP blocking using PPTP VPN, in case of blocking using Open VPN to go through. 13-? ? For protocol again it should be able to check if it can use SIP other wise using IAX.