Various E&M VoIP gateway series of AddPac is approved for its high performance and reliability in world-wide markets. AddPac provides highly advanced VoIP services in order to meet demanding and evolving business requirements of customers. Especially AddPac E&M VoIP Gateway has been developed through more than 10 years of experiences and accumulated know-how from existing enterprises and communication markets. AddPac E&M VoIP Gateway provides concurrent triple stack such as H323, SIP, MGCP and QoS (Quality of Service) for high quality of communication service. This will satisfy customers with high expectation.