[Asterisk-Users] How to enter billing codes when dialling

[AHBLWEB]

Our current ROLM switch uses two-digit Feature Access Codes (FACs) for
long-distance calls to force the entering of a set of seven digits
representing a client and matter number before giving a real dial tone.
This sequence is passed as part of the CDR record and is used to charge the
phone call to the correct matter.
 
Looking through the Asterisk documentation I can see how a fixed billing
code can be assigned to an extension so that the caller gets charged but how
can I set up a dialling plan similar to the above without having to write a
script to parse the matter number out of a stanard CDR record?
 
For example, a call to New York which should be charged to matter# 1234567
is dialled as;  77-1234567-1-212-555-1212.
 
Thanks,
 
Greg
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