If you’re calling people within your office on the same phone system, don’t use the intercom. When people do that to me, here’s my view of that person:
“Hi, I’m more important than anything you’re doing. You need to listen to me NOW.”
You’ve got to be kidding me.
Just call someone how you normally should. If they don’t answer, leave a message or email them. When they get the time, they’ll get back to you. If it’s really that urgent, shouldn’t you just see them in person?
Don’t pin them in the corner, or else they’ll make it hard on you in the future.
Oh yeah, don’t forget to smile!