VoIP

This call type occurs when an endpoint located in a site wants to reach a destination on the PSTN through the Voice over IP (VoIP) provider. The cluster in which the site is located provides the source country dial plan and routing is based on the source country.

The call type includes:

  • SIP/SCCP signaling traffic for the endpoint between the endpoint and Cisco Unified Communications Manager
  • SIP signaling traffic is used for the SIP Gateway to the VoIP network and Cisco Unified Communications Manager
  • SIP Gateway to the VoIP network can be PRI as well
  • VoIP network can be connected through the Session Border Controller (not shown in the diagram)
  • Media traffic between the endpoint and SIP trunk SBC

Off-Net Call (VoIP)

dialplan-Off-Net-Call-VoIP

Usage
  • Called number follows the Numbering Plan requirements
  • Called number can include an access code if necessary; the access codes can be either the same PSTN access code or a different access code
  • 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.
  • 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 Users can perform Off-Net call from any endpoint registered with Cisco Unified Communications Manager through the VoIP network if they subscribe
Usage Example Billing consolidation between domestic and international outgoing calls
Default Configuration
  • Not available to all users; only by subscription to VoIP network access
  • DDI of the DN is sent if available; otherwise, Site Published PSTN number is sent
  • Codec preference depends on trunk bandwidth
Configuration Choices
  • Feature availability by subscription to VoIP network access
  • Can be configured to send only the Site Published PSTN number as the Calling Number
  • Access code cannot be chosen by the user; it is defined by the provider
  • Automatic rerouting is not supported
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: Uses different PSTN Access Prefix and Trunk Transformation
CSS to convert DN to DDI
Phone A (DN=8 300 1234; External Mask=+14085289001)
Dial 0 12134225001
SIP2SIP GW Trunk {uses Called, Calling, Redirecting and Connected
Transformation CSS}
Outbound from CCM - CDPN = +12134225001; CGPN=+14085289001
Inbound Connected Number +12134225001