FILTER()
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FILTER() 

FILTER(allowedCharacters,string)

(beginning Asterisk 1.4)

Filters string so that only the allowed characters are returned.

; allow only 0123456789 from ${cdrnum}:
exten => 123,1,Set(foo=${FILTER(0123456789,${cdrnum})})
[Note]

Internal help for this application in Asterisk 1.4:  

  -= Info about function 'FILTER' =- 

[Syntax]
FILTER(<allowed-chars>|<string>)

[Synopsis]
Filter the string to include only the allowed characters

[Description]
Not available

diff output to internal help in Asterisk 1.2:  

-- not available in Version 1.2 --
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