LEN()
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LEN() 

LEN(string)

Returns the length of string.

; If ${test} is "Hello World"
exten => 123,1,Set(foo=${LEN(${test})})
; returns 11
[Note]

Internal help for this application in Asterisk 1.4:  

  -= Info about function 'LEN' =- 

[Syntax]
LEN(<string>)

[Synopsis]
Returns the length of the argument given

[Description]
Not available

diff output to internal help in Asterisk 1.2:  

- none -
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