[redserk]

To add, as someone who’s called offices to share opinions over the last several years:

You may get either voicemail or someone will pick up. A staffer will be who gets these messages, so be polite. Simply being polite means you’d be doing better than a lot of other callers.

I state my name, that I am a constituent, my city+ZIP, a brief message stating that I urge the congressperson to support/oppose an action and why.

If you’re talking to a human, give them a moment to jot it down and you’re done.

Also, you don’t have to call their DC office. If that line is busy, try a field office.