[Asterisk-Users] Is this a bug or by design? Workaround?

[Stig Andersson]

Hi,

I need to use the trailing 5 digits of a callerid. callerid may be anything
from a length of 4 to 10 digits in this case.

Using this:
-----------
SubString,cid=${CALLERIDNUM}|-5|5

Works great, BUT shows this message: 
  "The use of Substring application is deprecated. Please use ${variable:a:b} instead"


So, I try 
---------
SetVar(cid=${CALLERIDNUM:-5:5})

The result is a empty string if CALLERIDNUM is less than 5 digits long,
which is NOT the case of SubString. SubString command returns what remains of the variable,
that is - if CALLERIDNUM is 4 digits in length, it returns 4 digits. If CALLERIDNUM is 6 digits,
it returns 5 digits.

If this approach should replace "Substring" - it should behave identically, shouldn't it?

If by design, is there a workaround?

/Stig


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