What is the primary function of a Media Gateway in SIP?

The primary function of a Media Gateway in SIP (Session Initiation Protocol) is to switch calls between different networks, particularly when bridging the gap between the circuit-switched network (such as traditional telephone systems) and packet-switched networks (like VoIP). Media Gateways serve as critical components that facilitate the transmission and conversion of voice, video, and data streams between these differing network types. They handle tasks like signal translation and media conversion to ensure seamless communication, thereby allowing users on different networks to connect with each other.

While encoding audio packets is a function related to media processing, it does not fully capture the primary role of a Media Gateway, which encompasses broader functionalities, including the management of both voice and video signaling. Managing customer accounts is typically a function associated with Customer Relationship Management (CRM) systems and not within the operational scope of a Media Gateway. Firewall protection is more focused on security aspects and is usually handled by dedicated security devices or software rather than a Media Gateway, which is primarily concerned with call processing and media handling.