Aggregation (CBO)

This call type occurs when an endpoint located in a Site in one country wants to reach a destination in any country through Aggregation (Central Breakout). The cluster in which the site is located must have the source country dial plan. Routing is based on the source country. It is not possible for sites in a cluster to be in different countries.

The call type includes:

  • SIP/SCCP signaling traffic for the endpoint between the endpoint and Cisco Unified Communications Manager
  • SIP signaling traffic for SIP trunking between the SIP trunking Session Border Controller (SBC) and Cisco Unified Communications Manager
  • Media traffic between the endpoint and SIP trunk SBC

Off-Net Call (Aggregation)

dialplan-Off-Net-Call-aggregation

dialplan-Off-Net-Call-aggregation-option1

Usage
  • Called number follows the Numbering Plan requirements
  • Called number can include an access code if necessary
  • Any target number can be used, unless it is restricted by Class of Service
  • Off-net dialing can be completed in two ways:
    • When PDD is unavoidable, user can wait for interdigit timeout or press # without waiting for interdigit timeout
    • E.164 numbering format is supported with + as the first digit
  • Forced On-Net is supported and optional. A forced on-net call will not reach the Session Border Controller. It is either within the same cluster or cross cluster
  • As shown in the figure (Option 1), each source country has its own SIP trunk to the Session Border Controller. Otherwise, all source countries share the same SIP trunk to the SBC.
  • The calling number is one of:
    • DDI of the DN
    • Site Published PSTN number if the DN does not have a DDI, or
    • Site Published PSTN number regardless of the availability of DN DDI
  • MoH is supported
Accessibility User can perform Off-Net call from any endpoint registered with Cisco Unified Communications Manager
Usage Example User can dial any PSTN number from their phone
Default Configuration
  • Not available to all users; only by subscription to PSTN access
  • DDI of the DN is sent if available; otherwise, Site Published PSTN number is sent
  • Codec depend on trunk bandwidth
Configuration Choices
  • Available by subscription to PSTN access
  • Can be configured to send only the Site Published PSTN number as the Calling Number PRI, BRI, and so on
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: Using Trunk Transformation CSS to convert DN to DDI
Phone A (DN=8 300 1222; External Mask=+14085289001)
Dial 9 12134225010
Aggregation Trunk {uses Called, Calling, Redirecting and Connected
Transformation CSS}
Outbound from CCM - CDPN = +12134225010; CGPN=+14085289001
Inbound Connected Number +12134225010