To route calls to on-premises extension with existing on-premise Call Control, Webex Calling uses the Dial Plan feature. Similar to Route Pattern on CUCM, Dial Plan is a Set of Dial Patterns that represent on-premises extensions such as: ESN/on-net numbers, +E.164 patterns and SIP URI domains. To do this, we point the Dial Plan directly to Trunks or Route Groups.
For Webex Calling users to dial on-premises extensions, they can use either +E.164 or ESN (Enterprise Specific Number) format.
For each location we need a Dial Plan with two patterns:
1-+E.164 Pattern
2-ESN Pattern (Steering Digit + Location Routing Prefix + extension) or (Access code + Site code + extension).
For example:
For New York Location: We create a Dial Plan with two patterns, +1212525XXXX and 8212XXXX
For Texas Location: We create a Dial Plan with two patterns, +1512587XXXX and 8512XXXX
A Webex Calling User dials the +E.164 number +15125873001 of a user located at Texas Site, the Dialed number does not match any extension of provisoned users in Webex Calling. Then the Dialed number matches a +E.164 Pattern in the Dial Plan named TE-Site +1512587XXXX, the Dial Plan TE-Site points to the Route Group RG-TE then to the Trunk TE-CUBE. Webex Calling sends the call to the trunk TE-CUBE that points to the CUBE of Location Texas. The CUBE at the Location Texas extends the call to the On-premise Call Control TE-CUCM.
The Call Control TE-CUCM performs digits analysis and find a locally registered endpoint with the Directory Number +15125873001, the TE-Phone rings.
Enterprise Specific Number ESN on-net inter-site dialing can be used instead of the +E.164 format from Webex Calling to On-premises Call Control.
A Webex Calling Users dials 82122001 of a user located at New York Site, the Dialed Number does not match any extention of provisoned users in Webex Calling. Then the Dialed Numbers matches an ESN (Enterprise Specific Number) Pattern in the Dial Plan named NY-Site 8212XXXX. As with the +E.164 dialing, the Dial Plan NY-Site points to the Route Group RG-NY then to the Trunk NY-CUBE. Webex Calling sends the call to the trunk TE-CUBE that points to the CUBE of Location New York. The CUBE at the Location New York extends the call to the On-premise Call Control NY-CUCM.
To allow Enterprise Specific Number dialing from Webex Calling to Unified CM, the appropriate settings (extension length, prefix length,
and steering digit) must be configured and Unified CM must be configured
The Cisco Unified CM NY-CUCM must be configured to support the ESN dialing habit when routing calls received from Webex Calling. To do this we need a Translation Pattern with 8212.XXXX Pattern and the Called Party transformation "PreDot, Prefix +1212525 to normalize the Called Party so that the Dialed Number will be transformed to +12125252001 in order to match the Directory Number of NY-Phone.
To route PSTN Calls we use Locations to provide PSTN access (Premises-Based PSTN or cloud connected PSTN). Webex Calling locations group together devices or users sharing the same geographical location (address) or sites. To do this we point the Location of the respective Site to the Local Gateway or CUBE (Trunk) if the site uses the Premises-Based PSTN (for example UK Site) or we link the Location to the Cloud Connected PSTN directly if the site (for example SJ Site) prefers to use a Cloud PSTN.
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