Functional Overview

To completely integrate the IP extension in the MX-ONE Service Node architecture, two functions are needed:

The Registrar/Proxy function.
The SIP Proxy Server, which handles user registration and location, user capabilities, session setup and session management.
The Media Gateway function.
Provides real-time, two-way communication between SIP terminals on the IP network and other TDM devices and interfaces, or IP terminals when the call is GW.

In the MiVoice MX-ONE the gatekeeper (H.323) and the proxy/registrar (SIP) functions are handled in the same way.

Media (audio or data) transmission in GW calls between a SIP terminal and any other type of extension or trunk is made through the MX-ONE Media Gateway. Media transmission between two SIP terminals can pass directly through the IP network.

The gateway entity is composed either of software and hardware, or if prerequisites allow (i.e. when no TDM lines of types not supported by the Media Gateway are needed), only software, see

Figure 1. System Architecture, with SIP extensions

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