In a Multisite Deployment with overlapping site extension ranges, it is recommended to implement Inter-Site Dialing using access code and site code, then users dial an access code followed by a site code and the destination extension. To overcome the issue of overlapping extension and route calls without problems, traditionally with On-premise Call Control Cisco Unifed CM, the Translation Pattern is the powerful solution.
With Webex Calling, there is a concept of location, the concept of location allows the admin to group users sharing the same geophraphical address or site so that you can manage PSTN access (on-prem or cloud connected PSTN) for example.
For overlapping extensions with Webex Calling, Location is a powerful solution to implement the inter-site dialing using Routing Prefix.
While the technique is the same but the terms used on Webex Calling are'nt.
To provide unique inter-site dialing and to overcome the problem of overlapping extensions, with Webex Calling, we can use the Location Code ( similar to the Site Code for On-premise Cisco Unified CM) and a steering digit 8 which is similar to Access Code for On-premise Cisco Unified CM. The Steering Digit 8 is configured globally under Services > Calling. All inter-site dialing habit must start with 8. The Location Code is configured under each location and must be unique. As shown in the figure, under the location, navigate to Calling > Internal Dialing, in the Internal Dialing section, you see the Routing Prefix, the Routing Prefix that you will enter must start with the Steering Digit 8 configured globally followed by the Location Code for example 201, 202 and 203 for Benfica, Ajax and Juventus locations. Basically "Routing Prefix" consists of: Steering Digit + Location Code.
