The statement that a numbering plan has to be created manually is incorrect. Genesys Cloud CX provides several default, pre-configured numbering plans based on country codes (e.g., United States, Germany, United Kingdom). Administrators can use these default plans as they are, or they can copy and modify them to create custom plans. While manual creation is an option for building a plan from scratch, it is not a mandatory requirement, as the default plans serve as a functional starting point.

A. This is the correct, standard definition of a numbering plan used in telecommunications and is consistent with Genesys Cloud's terminology.

B. Genesys Cloud documentation explicitly uses the terms "numbering plan" and "dial plan" interchangeably to describe the rules for processing dialed numbers.

C. Numbering plans are designed to be fully customizable. Administrators can add, edit, copy, and delete them to meet specific organizational routing requirements.

1. Genesys Cloud CX Resource Center, "About numbering plans," Article ID: 2115.

Section: Overview

Content: "A numbering plan, also known as a dial plan, is a set of number-matching rules that tells Genesys Cloud how to process the numbers that users dial." This supports that options A and B are true. "Genesys Cloud provides several default numbering plans that you can use as is or as a starting point for your own numbering plans." This directly refutes option D.

2. Genesys Cloud CX Resource Center, "Create a numbering plan," Article ID: 2117.

Section: "Create a numbering plan" (Step-by-step guide)

Content: The documentation details the process for creating a new plan from scratch or copying an existing one, including the default plans. This confirms that plans can be added and modified, making option C a true statement. The existence of default plans to copy from further proves that manual creation from zero is not the only method.