Each extension here has a DID number. For example ext 200 is 588-6200. ext 201 is 588-6201, and etc ... anyway the main number is 588-6100, so the number that appears on caller ID on a phone is the main number. I want ext 200 to dial a number and the caller id will show 588-6200 instead of main number and same thing for the other extensions. Is there a way to do that on the switch?Please help.

No DID will not send out ID info,they are for inward dialing only.You will have to have a local line other than 588-6100.
Hope this helps
dtmf