VIVA offers IP based Converged Communications Solutions. You may contact VIVA for SIP Trunking, IP PBX & PSTN integration, MS OCS & IP PBX integration, Managed VoIP and ''''Secure'''' VoIP.
Digium VoIP gateway was created on a blend of the Asterisk Open Source communications engine and state of the art embedded platform, G100 provides the best value for the Asterisk connectivity.