asterisk users - Jun 2007 - Query regarding connecting PABX with Application server

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Dear all, 

We are connecting the PABX with Application server.What we are trying is that
when a nbr 1800 (this is not registered in PABX) is dialled the pabx should
route the call to Application server .The PABX should also have intelligence to
route the call by itself for its registered clients.For this scenario to work
please guide us what are the files we need to change and other necessary
details.If possible please also provide us the configuration that needs to be
set up in XLITE sip soft phone for this service.

Kindly do the needful. 

Thanks and regards, 
S.Ravi
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