Call Routing feature includes:

• Automatic Routing: Communication Manager provides automatic routing capabilities for public and private networks through Automatic Alternate Routing (AAR) and Automatic Route Selection (ARS). It determines the least-cost route available when a user places a call.

• En-bloc Dialing and Call Type Digit Analysis: En-bloc dialing allows users to place outgoing calls directly from their station call log without modifying the number.

• Generalized Route Selection: Generalized Route Selection extends AAR and ARS by evaluating additional call attributes to determine the optimal route. GRS supports both voice and data calls and maximizes the use of available facilities based on cost, quality, and routing policy.

• Multiple Location Support: Multiple Location Support enables Communication Manager to serve geographically distributed environments. It provides local time-of-day administration, location-based ARS public analysis, local trunking, automatic daylight saving time adjustments, and enhanced shared-resource allocation for remote gateways.

• Alternate Facility Restriction Level (Alternate FRL): Alternate FRL allows Communication Manager to dynamically adjust a trunk or station’s FRL or authorization code. Each line or trunk retains its primary FRL, and Communication Manager assigns alternate levels when routing conditions require them.

• Traveling Class Mark: Traveling Class Mark provides a mechanism for passing the calling party’s facility restriction level from one Electronic Tandem Network switch to another. This ensures that privilege checking is maintained consistently as calls traverse multiple switches.

• Answer Detection: Answer detection identifies when the called party answers an outgoing call to ensure accurate Call Detail Recording (CDR). Communication Manager supports answer supervision by time-out mechanisms, call-classifier boards, and network answer supervision.

• Source-Based Routing: With source-based routing, Communication Manager provides the location information of H.323, DCP, and analog stations to Session Manager. Session Manager uses this information to select the matching trunk or route pattern and then routes the call to the destination stations.

• QSIG Call Coverage: With QSIG Call Coverage, a call rerouted or forward-switched by QSIG uses the call coverage path of the diverted-to party. Based on the Communication Manager configuration, the greeting of the administered party is played to the caller.

• Delayed Drop: The Interworking of ISDN Clearing with In-Band Tones field on the SIP Trunk form allows Communication Manager to deliver the reason for the call drop to the caller. After receiving the reason, the caller or an automated application, such as Voice Portal can wait for the announcement to complete or disconnect the call.

• Inter-Gateway Alternate Routing (IGAR): IGAR provides enhanced Quality of Service (QoS) to large distributed single-server configurations. You can use IGAR for configurations where the IP network is not reliable enough to carry bearer traffic. When alternative IP transport paths are available, IGAR can use H.323 or SIP trunks instead of the Public Switched Telephone Network (PSTN) for bearer routing. Communication Manager Release 6.3.5 and earlier support IGAR for analog, DCP, and H.323 endpoints. Beginning with Release 6.3.6, IGAR support is extended to SIP endpoints.