Best way to direct PSTN calls based on CID

[citech]

Hi guys, would like to know your opinion on the best way to direct calls based on Caller ID.

I want to be able to have certain numbers from PSTN to go directly to a certain extension.

I know I can do this with Call Routing but I could pretty soon fill up the routing table with these "exceptions".

What would you recommend?

[Ashot]

Not sure regarding the best way, but here is an easy way to do want you want.
- Create a virtual extension (not attached to a line) and in FXO Settings route incoming calls to that extension;
- Go to the Caller ID Based Services for that extension. For Any Address configure unconditional call forwarding to Auto Attendant (00);
- for each certain PSTN number add a new entry in Caller ID Based Services and configure unconditional call forwarding to desired certain extension.

Now incoming calls from certain PSTN numbers will ring the certain extensions. Incoming calls from other PSTN numbers will be answered by Auto Attendant.