MTG3000 is a carrier-grade VoIP gateway, which is provided for telecom operators, ITSPs with strong Credibility and performance. Focusing on a concept of maintainable, manageable, and operable, MTG3000 adopts an STM-1 interface which features high integration and great capacity. It allows carrier-grade VoIP also FoIP services, as well as value-added functions such as modem and voice recognition. Thus it constructs a resilient, high-efficient, future-oriented communication network for users. MTG3000 handles a limit of signaling protocols, realizing the interconnection between SIP and traditional signals similar to SS7 and PRI. It supports different codec methods, offers signal encryption technology and smart voice recognition technology, and increases the utilizing efficiency of trucking resources while ensuring voice quality. The trunk gateway is for various networks of ITSPs, telecom operators, and large-scale enterprises.