Can you be more specific?
What is this PSTN Operator? Is this a particular PSTN number?
If your requirement is to have all users only to be able to dial operator and operator having access to only this PSTN Operator do as follows otherwise please elaborate.
1) Create a partition InternalPT for all IP Phones. Place all users and operator phones in this partition.
2) Next create a Calling Search Space. Name it InternalCSS. Assign this CSS to all users but not the operator.
3) Next create a partition ExternalPT for outside access.
4) Create a Calling Search Space called ExternalCSS and place this ExternalPT and InternalPT into it.
5) Assign this Calling Search Space to Operator
6) Create Translation patter 0 with InternalPT partition and CSS InternalCSS and called number as actual operator number.
7) Create a Route Pattern with the PSTN Operator number put it ExternalPT and choose correct gateway.
It will work.
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