10.6 CSS Handling in Cisco Unified Mobility

This topic describes how CSSs are implemented in Cisco Unified Mobility.

CSS Handling in Mobile Connect

Calls placed to office phone, redirected to remote phone:

  • Rerouting CSS of remote destination profile needs access to remote destination or destinations.

Calls from remote phone to internal destinations:

  • CSS of device that receives the call needs access to internal destination:
    1. Trunk
    2. Gateway

Depending on the origin of a call that uses the Mobile Connect feature, different CSSs are used:

  • For an incoming PSTN call to an office phone that is associated with a remote destination, the rerouting CSS at the remote destination needs access to the mapped remote destination number.
  • For an incoming call from a remote phone (remote destination) to an internal destination, the CSS of the receiving device (trunk, gateway) needs access to the called internal number.

CSS Handling in Mobile Voice Access

This section explains the use of CSSs for incoming and outgoing Mobile Voice Access calls.

CSS used for incoming Mobile Voice Access calls (gateway call application to Mobile Voice Access media resource) needs access to a partition that includes Mobile Voice Access media resource number:

  • Two options available depending on the Cisco CallManager service Inbound CSS for Remote Destination parameter:
    1. Trunk or Gateway Inbound CSS (default value)
    2. Remote Destination Profile + Line CSS (priority to line CSS)

CSS used for outgoing Mobile Voice Access calls (Mobile Voice Access media resource to PSTN)

  • Remote Destination Profile + Line CSS (priority to line CSS)

The incoming and outgoing call legs of a Mobile Voice Access call are treated independently. The incoming call leg is the call leg from the gateway where the Mobile Voice Access call application is running to the Mobile Voice Access media resource in the Cisco Unified Communications Manager. The CSS that is used for this call leg depends on a Cisco CallManager service parameter. This service parameter is called Inbound CSS for Remote Destination. The parameter can be set to one of these values:

  • Trunk or Gateway Inbound CSS: This value is the default value in the Cisco Unified Communications Manager. If this option is chosen, the Cisco Unified Communications Manager uses the CSS of the trunk or gateway from which the Mobile Voice Access call arrived. The CSS of the shared line and the CSS that is configured at the remote destination profile are not considered for the incoming call leg of a Mobile Voice Access call.
  • Remote Destination Profile + Line CSS: If this option is selected, the CSS of the shared line and the CSS that is configured at the remote destination profile are combined (with priority given to the partitions of the shared-line CSS).

The outgoing call leg of a Mobile Voice Access call is the call leg from the Mobile Voice Access media resource to the PSTN destination that is called from the Mobile Voice Access call application. The CSS that is used for this call leg is always the combination of the CSS of the shared line and the CSS that is configured at the remote destination profile (with priority given to the partitions of the shared-line CSS).