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Voice Translation Rules

Document ID: 61083

Updated: Nov 28, 2006

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Introduction

This document discusses how to define voice translation rules.

Note: The syntax used throughout this document is:

  • rule precedence /match pattern/ /replacement pattern/

    Note:  / -- / delimits the whole number.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Simple Match and Replace

Example 1

This example replaces the first occurrence of the number "123" with "456".

voice translation-rule 1
 rule 1 /123/ /456/  

These are test voice translation-rule examples:

router#test voice translation-rule 1 123
Matched with rule 1
Original number: 123    Translated number: 456

router#test voice translation-rule 1 1234
Matched with rule 1
Original number: 1234   Translated number: 4564

router#test voice translation-rule 1 6123
Matched with rule 1
Original number: 6123   Translated number: 6456
router#test voice translation-rule 1 6123123
Matched with rule 1
Original number: 6123123        Translated number: 6456123
Original number type: none      Translated number type: none
Original number plan: none      Translated number plan: none

In this example, the rule matches the first occurrence of the number that contains the pattern "123" anywhere in the number. Specifically, you can use the start and end of number indicators. The Example 2 and Example 3 sections show this.

Example 2

This example shows how to replace any occurrence of "123" at the start of a number with "456".

voice translation-rule 1
 rule 1 /^123/ /456/  

These are test voice translation-rule examples.

router#test voice translation-rule 1 123 
Matched with rule 1
Original number: 123    Translated number: 456

router#test voice translation-rule 1 1234
Matched with rule 1
Original number: 1234   Translated number: 4564

router#test voice translation-rule 1 6123
6123 Didn't match with any of rules

Example 3

If you want only the match of an exact number, specify both the start and end number indicators:

voice translation-rule 1
 rule 1 /^123$/ /456/ 
router#test voice translation-rule 1 123 
Matched with rule 1
Original number: 123    Translated number: 456

router#test voice translation-rule 1 1234
1234 Didn't match with any of rules

router#test voice translation-rule 1 6123
6123 Didn't match with any of rules

Pattern Match with Wildcards

These tables define wildcard and wildcard combinations and show some examples.

Wildcard Definition
. Any single digit
0 to 9,*,# Any specific character
[0-9] Any range or sequence of characters
* Modifier—match none or more occurrences
+ Modifier—match one or more occurrences
? Modifier—match none or one occurrence

Wildcard Combination Definition
.* Any digit followed by none or more ocurrences. This is effectively anything, including null.
.+ Any digit followed by one or more ocurrences. This is effectively anything, except null.
^$ No digits, null

Example 1

This example replaces any five-digit number that begins with "40" with the number "6666000".

voice translation-rule 1
 rule 1 /^40.../ /6666000/
router#test voice translation-rule 1 40123
Matched with rule 1
Original number: 40123    Translated number: 6666000

Example 2

This example replaces all numbers with "5554000".

voice translation-rule 2
 rule 1 /.*/ /5554000/
router#test voice translation-rule 2 123
Matched with rule 1
Original number: 123    Translated number: 5554000

router#test voice translation-rule 2 86573
Matched with rule 1
Original number: 86573  Translated number: 5554000

router#test voice translation-rule 2 ""
Matched with rule 1
Original number:   Translated number: 5554000

Example 3

This example replaces all numbers, except null, with "5554000".

voice translation-rule 2
 rule 1 /.+/ /5554000/
router#test voice translation-rule 2 123
Matched with rule 1
Original number: 123    Translated number: 5554000

router#test voice translation-rule 2 "" 
 Didn't match with any of rules

Example 4

This example replaces any number that starts with a combination of zeros (0, 00, and so forth) with "909".

voice translation-rule 5
 rule 1 /^0+/ /909/
router#test voice translation-rule 5 0123456
Matched with rule 1
Original number: 0123456        Translated number: 909123456

router#test voice translation-rule 5 00123456
Matched with rule 1
Original number: 00123456       Translated number: 909123456

router#test voice translation-rule 5 000123456
Matched with rule 1
Original number: 000123456      Translated number: 909123456

router#test voice translation-rule 5 123456   
123456 Didn't match with any of rules

Number Slice

You can use number slice when you need to copy parts of a matched number across to the replacement number. You slice the matched number into sets that you can keep or ignore.

Character Description
\ In the match pattern, indicates where to slice up the number.
\ In the replacement pattern, indicates where to copy the sets to keep.
( ) Indicates which sets in the matched number to keep.

Character Usage Description
(a\) Keep expression "a".
b\ Ignore expression "b".
\1 Copy the first set into the replacement number.

Generic Example

This example provides a general explanation.

/ (x\) y\ (z\) /  /w\1\2/	

Split the matched number into three sets of x, y, and z. The backward slash (\) indicates the places to slice up the number. The brackets () indicate which sets you want to reuse in the replacement pattern. The w represents additional digits to insert into the replacement number.

  • Set 1 becomes expression x.

  • Set 2 becomes expression z.

  • Expression y is ignored.

The replacement number is a concatenated number: wxz.

Specific Example

This example provides further detail:

voice translation-rule 1
 rule 1 /^\(12\)3\(45\)$/ /6\1\2/
  • Set 1: 12

  • Set 2: 45

  • Ignore: 3

router#test voice translation-rule 1 12345
Matched with rule 1
Original number: 12345        Translated number: 61245

Number Type and Plan

You can restrict matches to particular number or plan types. Also, you can alter the replacement plan or type.

Example 1

In this example, if a number starts with "4" and the type is "national", the rule adds "90" as a prefix. If the type is "international", the rule adds "900" as the prefix.

voice translation-rule 7
 rule 1 /^4/ /904/ type national national
 rule 2 /^4/ /9004/ type international international
router#test voice translation-rule 7 493456567 type national
Matched with rule 1
Original number: 493456567      Translated number: 90493456567
Original number type: national  Translated number type: national
Original number plan: none      Translated number plan: none
	
router#test voice translation-rule 7 493456567 type international
Matched with rule 2
Original number: 493456567              Translated number: 900493456567
Original number type: international     Translated number type: international
Original number plan: none              Translated number plan: none

This is useful when telephone companies (Telcos) remove access codes on national and international numbers. You can add the correct prefix with the number type as a basis.

Example 2

This example changes the number type and plan.

voice translation-rule 8 
 rule 1 /^2\(...$\)/ /01779345\1/ type unknown national plan unknown isdn

This rule matches any four-digit number that starts with "2". The rule removes the "2", adds the number "01779345" as a prefix, and sets the plan to "isdn" and the type to "national".

router#test voice translation-rule 8 2001 type unknown plan unknown 
Matched with rule 1
Original number: 2001   Translated number: 01779345001
Original number type: unknown   Translated number type: national
Original number plan: unknown   Translated number plan: isdn

Reject Calls

Use the reject keyword to reject calls that match. This example rejects all calls that start with "234".

rule 1 reject /^234/
router#test voice translation-rule 10 1234
1234 Didn't match with any of rules

router#test voice translation-rule 10 2345
 blocked on rule 1

Apply Rules

Voice Translation Rules are applied to Voice Translation Profiles. These profiles are then applied to dial peers or voice ports. Profiles can be applied to VoIP or POTS dial peers or voice ports, and can be applied to inbound or outbound calls. A profile can translate Called, Calling, or Redirecting numbers.

voice translation-rule 3 
 rule 1 /123/ /456/ 

voice translation-profile profile1
 translate calling 3 

dial-peer voice 10 pots
 translation-profile outgoing profile1

More Examples

Truncate Numbers Down to the Last Two Digits

rule 1 /^.*\(..\)/ /\1/

This is a number divided into one set and one ignored statement.

  • Ignored: ^.* None or more digits from the beginning of number

    Set 1: .. two digits

The replacement statement specifies Set 1. This rule copies the last two digits of the number.

router#test voice translation-rule 9 12345
Matched with rule 1
Original number: 12345	Translated number: 45

router#test voice translation-rule 9 123456
Matched with rule 1
Original number: 123456	Translated number: 56

Remove Unwanted Digits in a Number

This example is useful because certain Telcos have been known to insert hypens into calling party numbers. Since this is against standards, it causes the calling party number to be ignored. The Telco sends the calling numbers in two formats, with one hypen and sometimes with two. Two rules are required in the voice translation rule. Additionally, the first format can have five or six digit numbers after the hypen. You can match both of these conditions using one rule with the '?' character (match none or one occurrence).

Notes on special characters:

  • The hyphen character is used to indicate a range in a match pattern, for example [0-9]. In order to indicate in this rule that you want to match on the hypen character, it is necessary to use the '\' character to escape its meaning. This is because the hyphen character is a special character. The '\-' characters really means hyphen. The trailing '\' indicates that the number is sliced here.

  • If you type ? directly, IOS thinks it is a request for help. You must type Control-V then ?.

voice translation-rule 12
 rule 1 /^\(01...\)\-\(......?$\)/ /\1\2/ 
 rule 2 /^\(0[12]..\)\-\(...\)\-\(....$\)/ /\1\2\3/

Rule 1: The number is sliced into three sequences, with two sets to be kept.

  • Set 1: 01...

    Ignore: -

    Set 2: ...... or .....

Rule 2: The number is sliced into five sequences with three sets to be kept.

  • Set 1: 0[12]..

    Ignore: -

    Set 2: ...

    Ignore: -

    Set 3: ....

router#test voice translation-rule 12 "01208-333444"
Matched with rule 1
Original number: 01208-333444   Translated number: 01208333444

router#test voice translation-rule 12 "01208-72345" 
Matched with rule 1
Original number: 01208-72345    Translated number: 0120872345

router#test voice translation-rule 12 "0161-333-4444"
Matched with rule 2
Original number: 0161-333-4444  Translated number: 01613334444

router#test voice translation-rule 12 "0208-123-4567"
Matched with rule 2
Original number: 0208-123-4567  Translated number: 02081234567

Related Information

Updated: Nov 28, 2006
Document ID: 61083