Starcraft II Screenshot image - Raidcall Application

Raidcall uses the Client-Server Model to transfer data, rather than using the P2P Model such as Skype, which takes up more bandwidth from user. When user is talking in this Client-Server model, RaidCall sends one stream of data to the RaidCall server , then the server broadcasts it to other users in the same channel. Hence it requires very little bandwidth for voice communication and support more than 1000 slots per channel.