here's an exerpt from Alex for RONDI :
The command is used to set number data for an existing route.
[tt]
PRE is used to prefix incoming called numbers. Used at direct in-dialling traffic, when the public exchange or interworking exchange can only send a limited number of digits to the receiving exchange.
ROUDIR is a directory number to use for all incoming calls on an incoming route. May only be stated if the route permits incoming traffic.
EXNOPU and EXNOPR are used to build up a public and a private exchange number table, with exchange numbers to prefix a directory number with, to use when composing a complete (public/private) number (calling/connected number) to send to an interworking exchange.
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