# 3G-324M Interface

The 3G-324M Interface provides a flexible API for bridging 3G-324M clients into an IP network to provide access to various enhanced services applications. It allows for simple and flexible call setup with 3G-324M terminals on one side of the interface, while providing control for IPv4 or IPv6 media endpoints on the other side. However, data must enter the interface in 3G-324M format.

The 3G-324M Interface consists of the following components:

Component | Description
NMS CG board | A board that provides DSP processing resources and network interfaces that can be used by the 3G-324M Interface.
MSPP service functions with video-enhanced components | A set of MSPP functions that create and control media RTP endpoints, H.223 MUX endpoints, and channels for audio and video media connectivity. These video-enhanced functions are available only when you install Video Access and the supporting version of Natural Access.
H.324M Middleware | A set of H.324M functions that provide call session control capabilities, including opening and closing media channels, as well as sending and receiving control messages between the system application and the remote terminals. While this component is used by an application in conjunction with Natural Access, it is not itself, a Natural Access service.
Host application | A user-created application that uses Natural Access functions and H.324M Middleware functions to control call activity.

Developers can use Natural Access to govern non-media specific functions, such as call control signaling, trunk monitoring, OAM, and other functionality that are also performed on the same platform.

Note: An IP signaling component for IP call control is not included in the Video Access 3G-324M Interface.

The following illustration shows the components of the 3G-324M Interface. These components are shaded.