What defines the DialPlan on a Cisco Voice Gateway/CUBE?

Dial peers are the fundamental building blocks that define the dial plan on a Cisco IOS Voice Gateway or Cisco Unified Border Element (CUBE). Each dial peer acts like a static route for a voice call, matching specific digit patterns (using the destination-pattern command) and associating them with a destination, such as an IP address for a VoIP call or a physical voice port for a PSTN call. The collection of all configured dial peers on the device constitutes the complete dial plan, dictating how all inbound and outbound calls are routed.

A. ATR: This is not a standard or recognized Cisco IOS configuration component used for defining a voice dial plan.

B. voice-class: A voice-class is a configuration element used to group and apply specific policies (e.g., codec lists, SIP profiles) to dial peers, but it does not define the core call routing logic itself.

C. Voip voice: This is a syntactically incorrect phrase and not a valid Cisco IOS command or configuration element for defining a dial plan.

1. Cisco Unified Border Element Configuration Guide (Through-Version 15.6M&T)

"Dial Peer Configuration on CUBE" chapter

Overview of Dial Peers on CUBE section. It states

"Dial peers are the basis for the Cisco Unified Border Element (CUBE) dial plan."

2. Dial Peer Configuration on Voice Gateway Routers Configuration Guide

Cisco IOS Release 15M&T

"Information About Dial Peer Configuration on Voice Gateway Routers" section. This guide explains

"Dial peers are a critical component of a dial plan on a voice gateway."

3. Cisco IOS Voice Command Reference

dial-peer voice command documentation. The guide details how this command is used to create and configure dial peers

which are the essential elements for routing voice calls and forming the dial plan.