Route Filters

Route filters can be used only with the @ route pattern to match certain elements or special numbers of a numbering plan. A route filter applied to a pattern not containing the @ wildcard is ignored.

The logical expression entered with the route filter can be up to 1024 characters, excluding the Not-Selected fields.

For large-scale deployments, use explicit route patterns rather than the @ wildcard and route filters. This practice also facilitates management and troubleshooting because all patterns configured in CUCM are easily visible from the Route Pattern Configuration page.

Tags serve as the core component of a route filter. A tag applies a name to a subset of the dialed-digit string. For example, the NANP number 972 555-1234 comprises LOCAL-AREA-CODE (972), OFFICE-CODE (555), and SUBSCRIBER (1234) route filter tags. Table 11-7 provides the complete list of tags available for the NANP.

Table 11-7 NANP Tags

Tag

Description

AREA-CODE

This 3-digit area code in the form [2-9]XX identifies the area code for long-distance calls.

COUNTRY CODE

These 1-, 2-, or 3-digit codes specify the destination country for international calls.

END-OF-DIALING

This single character identifies the end of the dialed-digit string. The # character serves as the end-of-dialing signal for international numbers that are dialed within the NANP.

INTERNATIONAL-ACCESS

This 2-digit access code specifies international dialing. Calls that originate in the United States use 01 for this code.

INTERNATIONAL-DIRECT-DIAL

This 1-digit code identifies a direct-dialed international call. Calls that originate in the United States use 1 for this code.

INTERNATIONAL-OPERATOR

This 1-digit code identifies an operator-assisted international call. This code specifies 0 for calls that originate in the United States.

LOCAL-AREA-CODE

This 3-digit local area code in the form [2-9]XX identifies the local area code for 10-digit local calls.

LOCAL-DIRECT-DIAL

This 1-digit code identifies a direct-dialed local call. NANP calls use 1 for this code.

Table 11-7 NANP Tags (Continued)

Tag

Description

LOCAL-OPERATOR

This 1-digit code identifies an operator-assisted local call. NANP calls use 0 for this code.

LONG-DISTANCE-DIRECT-DIAL

This 1-digit code identifies a direct-dialed, long-distance call. NANP calls use 1 for this code.

LONG-DISTANCE-OPERATOR

These 1- or 2-digit codes identify an operator-assisted, longdistance call within the NANP. Operator-assisted calls use 0 for this code, and operator access uses 00.

NATIONAL-NUMBER

This tag specifies the nation-specific part of the digit string for an international call.

OFFICE-CODE

This tag designates the first 3 digits of a 7-digit directory number in the form [2-9]XX.

SATELLITE-SERVICE

This 1-digit code provides access to satellite connections for international calls.

SERVICE

This 3-digit code designates services such as 911 for emergency, 611 for repair, and 411 for information.

SUBSCRIBER

This tag specifies the last 4 digits of a 7-digit directory number in the form XXXX.

TRANSIT-NETWORK

This 4-digit value identifies a long-distance carrier. Do not include the leading 101 carrier access code prefix in the TRANSIT-NETWORK value. Refer to TRANSITNETWORK-ESCAPE for more information.

TRANSIT-NETWORK-ESCAPE

This 3-digit value precedes the long-distance carrier identifier. The value for this field specifies 101. Do not include the 4-digit carrier identification code in the TRANSIT-NETWORKESCAPE value. Refer to TRANSIT-NETWORK for more information.

■ Example 1: A route filter that uses AREA-CODE and the operator DOES-NOT-EXIST selects all dialed-digit strings that do not include an area code (for example, seven-digit calls).

■ Example 2: A route filter that uses AREA-CODE, the operator ==, and the entry 515 selects all dialed-digit strings that include the 515 area code (equivalent to a route pattern 515XXXXXXX or 1515XXXXXXX).

■ Example 3: A route filter that uses AREA-CODE, the operator ==, and the entry 5[2-9]X selects all dialed-digit strings that include area codes in the range of 520 to 599.

■ Example 4: A route filter that uses TRANSIT-NETWORK, the operator ==, and the entry 0288 selects all dialed-digit strings with the carrier access code 1010288.

Route patterns and translation patterns can be configured to block the pattern. Patterns that are blocked prevent calls to the blocked pattern cluster-wide.

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Responses

  • Brancaleone
    What is the use of route filter in cucm?
    2 years ago

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