Use Feature 66, but if it doesn't work, go to the phone you are trying to reach and cancel voice call deny...F#88. If that person is on the phone, your voice call will come thru as an intercom call.
I like to label a button with the words INTERCOM and lable the line button with actual lines 1,2,3, ext.. You could also label it HANDSFREE then they do not have to do all the dialing just press the button and then an Internal dial button just two keystrokes.
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