[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??

There is one file namely pbx.c.. is it possible to play any prompt in this
file??????
-- 

Regards
M Jamshed CC
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