What determines whether a gateway does digit-by-digit matching?


A gateway uses digit-by-digit matching if the incoming dial peer is not configured for direct-inward-dial. If the incoming dial peer is configured for direct-inward-dial, the entire digit string is matched. The exception is if the incoming call is ISDN with overlapping receiving.


What is the default order of operation for matching outbound dial peers?


Most specific match is the first selection. If two equivalent matches exist, the peer with the highest configured preference is selected. If preferences are equal, the selection is random.


What is necessary for a dial peer to be considered operational?


You must configure the dial peer with an answer address or an incoming called number or both a destination pattern and a target.


Which factors must you balance when designing a dial plan?


You must balance ease of use for end users with administrative overhead and scalability.


What end-user issue can be caused by an overlapping dial plan?


An overlapping dial plan requires the interdigit timer to expire before the appropriate route pattern can be selected. This results in a long post dial delay. You can minimize this issue by reducing the interdigit timer or by training users to use the # to indicate they have entered all digits.


What is the default dial peer?


The default dial peer is a system dial peer that is used to match inbound calls if the call does not match a configured dial peer.


Which number is used to match the destination pattern on a dial peer?


For inbound dial peers, the calling number (ANI) is used to match the destination pattern. For outbound dial peers, the called number (DNIS) is used to match the destination pattern.


How are dial peers configured to accommodate an overlapping dial plan?


For the dial peers that have overlapping destination patterns, you need to add a T to the end of the digit string. This signifies that the digit matching should not occur until the interdigit timer expires.

Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol


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


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

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