Abstract: Currently computer network is widely using in transmitting information especially the connection between servers located in Head Quarter and users in branches. Beside the information, they have to call to others which is separated system. If they consolidate into the existing computer network, the organization can deduct some expenses and boost the utilization on existing infrastructures. The VoIP technology has been widely accepted and has received a boost in many countrieswhere users are now migrating from the legendry Public Switch Telephony Network (PSTN) to VoIP because of the numerous benefits it offers but unfortunately the organizationin Laos is yet to key into this promising technology. This study therefore focuses on introducing and implementing this technology in a converged network in Laos environment by the use of open source Asterisk.

Keywords: VoIP, SIP, Converged Network, Asterisk.