Genesys Cloud provides default number plans and allows administrators to create and modify custom number plans to support advanced call routing tailored to organizational requirements. Administrators access this functionality through Admin > Telephony > Sites, where they select a specific site and navigate to the Number Plans tab to create new plans. Each number plan requires a name and selection from five match type options: Digit Length, E.164 Number List, Inter-Country, Intra-Country Number List, or Regular Expression. Configuration parameters vary by match type and may include digit count specifications, E.164 format number ranges, country code matching selections, or regular expression patterns with normalized number expressions. All plans must include a classification assignment. The system processes number plans sequentially from top to bottom, allowing administrators to reorder plans via drag-and-drop functionality to establish proper call routing priority. A system-wide limit of 200 number plans applies, and the Telephony > Plugin > All permission is required to perform these administrative tasks. Number plan configuration supports location-specific emergency and support service routing based on geographic requirements. In United States and Canada locations, number plans should be configured as "911, 933" to support both emergency calls and emergency test calls. In Switzerland locations, number plans should include "142" to enable access to victim support services. This functionality enables organizations to implement regional compliance requirements and customize emergency service routing according to geographic location specifications.