asterisk users - Feb 2006 - Problems with certain Global Variables not passing correctly.

I have the following in my extensions.conf

exten => s,4,MixMonitor(${DATETIME}_${CALLERID}_${EXTEN}.wav)

The ${EXTEN} works correctly, however the ${DATETIME} (I have tried
${TIMEDATE} too) and ${CALLERID} (tried with ${CALLERID(num)}) doesn't.
There just isn't any information assigned to those variables it seems.

Is there another location these variables need to be initialised or
should they work out of the box.

I am using the latest svc from Digium.

Regards,
Michael Dunne

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