Various Digital 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 Digital VoIP Gateway has been developed through more than 10 years of experiences and accumulated know-how from existing enterprises and communication markets. AddPac Digital VoIP Gateway provides concurrent triple stack VoIP Signaling such as H323, SIP, MGCP, and supports ISDN-PRI, R2, SS7* Digital Interface Signaling. Also AddPac Digital VoIP Gateway supports QoS (Quality of Service) for high quality of VoIP communication service. This will satisfy customers with high expectation.