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Primary Rate Interface (PRI) and T1 Feature

Description

Call-by-Call Services Table

When a call is placed on a call-by-call B-channel group, the dialed number and type of call must match one of the entries, the specified number of digits is deleted, and the specified service is selected. Similar patterns for the same type of call are permissible in this table; in such a situation, the feature selects the entry with the longest matching pattern. For example, based on the entries in the Sample Call-by-Call Services table. and a voice call with a Called Party Number (CdPN) of 908957, Entry 1 is selected, not Entry 2. The last entry is used if the patterns are of equal matching digits.

For each entry, the following can be specified: a set of patterns, the type of call, the service to use, and the number of digits to delete.

Characteristics and valid entries for the Call-by-Call Services table are as follows:

• By default, the patterns are blank, Call Type is Both, Service is blank, and Delete Digits is 0.
  
  
• There can be up to 10 entries (0 through 9).
  
  
• Each entry can contain up to 10 patterns of up to eight digits each.
  
  
• The number of digits to delete can be from 0 through 8 (default is 0).
  
  
• The user can use an entry as a default by selecting a Call Type and Service and not specifying any patterns.
  
  
• If Service is null (not selected), the entry is ignored. Null and No Service are not equivalent.

Call-by-Call Service selection closely resembles ARS in reducing costs and maximizing the benefits derived from limited resources. While ARS selects the most cost-effective route, Call-by-Call Service selection selects the optimal service for that particular call. Call-by-Call Service selection is integrated with ARS by including the bearer capability of the calling party in its routing decisions. ARS serves as the main gateway for accessing the call-by-call B-channel group. The basic calling process for Call-by-Call Service selection with ARS is as follows:

1. A user dials ARS.
   
   
2. ARS selects the route and, in this case, the route points to a call-by-call B-channel group.
   
   
3. ARS performs digit deletion/addition operations for the route and, in so doing, may indirectly specify the best service for the call.
   
   
4. With these ARS outgoing digits, the call-by-call B-channel group selects the service, possibly based on digits added by ARS, and performs digit deletion as required.
   
   
5. A call setup message is sent to the network/central office switch.

Topics
	Description
	Called Party Nunber (CdPN) Calling Party Number (CPN) Lines / Trunks PRI T1 DS1 Facility Options Type of Service Framing Format Line Coding Channel Service Unit   Line Compensation Signaling Mode Tandem PRI Trunks Tandem PRI Trunk Programming PRI Programnming Options PRI Programnming Options - PRI Telephone Number PRI Programnming Options - Network Services Supported PRI Programnming Options - Copy Telephone Number to Send PRI Programnming Options - Telephone Number to Send PRI Programnming Options - Test Telephone Number   PRI Programnming Options - Timers and Counters PRI Programnming Options - Terminal Equipment Identifier (TEI) PRI Call Processing Incoming Calls Outgoing Calls Network Selection Table Call-by-Call Services Table Station Identification - Automatic Number Identification T1 Programming Options T1 Programming Options - T1 Tie Trunk Connections T1 Programming Options - T1 Routing by Dial Plan System-wide Programming Options - Clock Synchronization System-wide Programming Options - Clock Switching
	At a Glance
	Considerations & Constraints
	Incoming Calls Outgoing Calls
	System Programming
	Mode Differences
	Feature Interactions