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.
Asterisk & Skype are becoming merged entities, once technology is integrating features and functionality of one into others software, allowing customers to make Skype calls from their Asterisk phones.