asterisk users - Sep 2005 - function LEN missing

I'm running asterisk 1.2b1 and all seems to be working right in general.  I
load modules explicitly in modules.conf, and since my upgrade ast 1.09 I
have only one problem:
 
The LEN function (length of string).  What module do I need to load to get
this string handling function?
 
 
Thanks
MD
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