Inter-Site On-Net Call

The deployment model supports multiple sites with overlapping extensions and inter-site calling by dialing the Site Location Codes prefixed with an inter-site prefix, and supports the following dialing capabilities:

  • Inter-site dialing prefix
  • Variable length extensions between sites with no post-dialing delay (PDD) cause by timeout

When the user dials a directory number of another user, the leaf cluster first examines the site code, and determines if the site code is for a site on the same cluster or another cluster. If the site is on the same cluster, the call is routed to the correct location and delivered to the phone. If the site code is for a site on a different cluster, routing is as described in the following section.

This call type occurs between two endpoints located on different sites. The sites can be on a different Cisco Unified Communications Manager that belongs to the same customer. As shown in the following figure, media traffic is between the endpoints.

On-Net Call (Inter-Site)

dialplan-inter-site

Usage
  • User can be located in the same or different countries (sites can be in different countries and or different Cisco Unified Communications Manager clusters)
  • Target numbering must follow the Numbering Plan described in this chapter
  • Target number can be either DN or ISP +DN depending on the enterprise internal numbering plan adopted. DN can be either just Extension for flat Dial Plan or SLC + Extension or ISP + SLC + Extension.
  • Any target number can be used unless restricted by Class of Service
  • Codec is dynamically selected based on the endpoints used
Accessibility User can perform On-Net call from any endpoint registered with Cisco Unified Communications Manager
Usage Example Reduces costs of Inter-site and International calls by sharing available bandwidth with Data Network
Default Configuration Available to all users
Configuration Choices
  • Feature availability cannot be changed
  • Codec preferences are configuration
Redundancy Available to users without restrictions
Survivability Not available to users in fallback mode
Endpoint Types Supported
  • Cisco IP phones
  • Cisco ATA
  • Cisco VG
Examples 
Case 1: DN = ISP+SLC+Extension
Phone B (DN=8 100 2345)
Dial 8 200 6789 (for Phone C)
Phone B Connected Number shows 8 200 6789

Phone C (DN=8 200 6789)
On Answer, display shows 8 100 2345 -Calling Party Number

Case 2: DN = SLC+Extension; Extension Prefix is used for
Extension dialing (for example 6)
Phone A (DN=300 4040)
Dial 300 4050 (Phone B extension)
Phone D Connected Number shows 300 4050

Phone D (DN=300 4050)
On Answer display shows 300 4040 -Calling Party Number

Case 3: DN= Extension {Dialing with full DN}
Phone A (DN=40404040)
Dial 40404050 (Phone D extension)
Phone A Connected Number shows 40404050

Phone D (DN=40404050)
On Answer display shows 40404040 as the Calling
Party Number