Interworking DTMF Mismatch

C.

When a DTMF mismatch occurs between an MGCP gateway registered FXS port and a Cisco Unified Communications Manager SIP trunk, the media resource that can be leveraged to interwork this mismatch is a Media Termination Point (MTP).

DTMF (Dual-Tone Multi-Frequency) is used for transmitting signals when a user presses a button on a telephone keypad during a call. MGCP (Media Gateway Control Protocol) is a protocol used to control media gateways. SIP (Session Initiation Protocol) is used for initiating, modifying, and terminating multimedia sessions.

In this scenario, the MGCP gateway and Cisco Unified Communications Manager SIP trunk are using different DTMF methods, which is causing the mismatch. An MTP can be used to interwork this mismatch by providing DTMF interworking between the two devices. The MTP is a software-based resource that can provide functions such as DTMF interworking, codec conversion, and transcoding.

The other media resources listed are not suitable for this scenario:

• Conference Bridge: A conference bridge is used for setting up conference calls and does not provide DTMF interworking.

• Trusted Relay Point: A Trusted Relay Point is a feature that can be used to interwork different codec types between endpoints, but it does not provide DTMF interworking.

• Annunciator: An annunciator is a device that provides voice prompts or announcements during a call and does not provide DTMF interworking.

Therefore, the correct answer is C. Media Termination Point.