if i understood ur question u need an internal DN of 3000 to appear in called party display as 545-3000 and DN of 4000 to appear in called party display as 545-4000 and DN 5000 to appear in called party display as 545-5000 and so on..
if so use External Phone Number Mask under Directory Number conf page of 545-XXXX, then you should select the Use Calling Party's External Phone Number Mask check box in Route Pattern
note 1: it is not recommended to manipulate outbound caller id at route pattern and route list level together, even that route list level overrides the route pattern settings.
note 2: debug isdn q931 on the GW to see if the GW sends the correct caller ID to the Telco, if yes, and caller id doesn't work yet then Telco is overriding the information.
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