[asterisk-ss7] how to play voice prompt without charging for the subscriber

[M Jamshed]

Dear,

I' m having a big problem...
The matter is.  if all our services are down then i need to play a voice
prompt (5 sec prompt) which should not be charged for the subscriber.. is
there any solution for this?????
please tell give me a solution as soon as possible..
i have tried with out Answer option in extensions.. still its showing as
ANSWERED in CDR.
wht will i do... do anyone have the solution for this??
-- 

Regards
M Jamshed CC
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