1

What role does the call agent play when using an MGCP gateway?

Answer:

A call agent is essential when you are using an MGCP gateway. It knows the dial plan, so it tells the gateway where to route calls. It controls the setup and teardown of connections to endpoints on the gateway, and thus the setup and teardown of calls.

2

List the control messages that MGCP uses.

Answer:

NotificationRequestRQNT

NotifyNTFY

CreateConnectionCRCX

ModifyConnectionMDCX

DeleteConnectionDLCX

AuditEndpointAUEP

AuditConnectionAUCX

EndpointConfigurationEPCF

RestartInProgressRSIP

3

How does MGCP Backhaul function?

Answer:

The gateway terminates ISDN Q.921 messages but places the Q.931 messages in a TCP packet and sends them to the CallManager for processing.

4

What three commands do you need to enable MGCP on a router and identify Cisco CallManager as its call agent?

Answer:

mgcp

mgcp call-agent [ip-address|hostname] [port] 5ccm-manager mgcp

5

Why is there a need for DTMF relay in a VoIP network, regardless of the gateway protocol used?

Answer:

When you are using codecs that compress voice, DTMF tones might become distorted or part of the signal might be lost. Then the receiver would not be able to respond correctly to the numbers that were sent.

Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol

H.323

Session Initiation Protocol

Circuit Options

Connecting to the PSTN

Connecting to PBXs

Connecting to an IP WAN

Dial Plans

Digit Manipulation

Influencing Path Selection

Configuring Class of Restrictions

SRST and MGCP Gateway Fallback

DSP Resources

Using Tcl Scripts and VoiceXML

Part III: Gatekeepers

Deploying Gatekeepers

Gatekeeper Configuration

Part IV: IP-to-IP Gateways

Cisco Multiservice IP-to-IP Gateway

Appendix A. Answers to Chapter-Ending Review Questions

Index



Cisco Voice Gateways and Gatekeepers
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
Year: 2004
Pages: 218

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