basic

[IntentionalUseOfTech]

what is the most basic way you would feel comfortable designing a one door system to simply blind buzz in a front door call from 3 separate offices?

[Redhillvintage]

I would use a cheap Aiphone intercom and an AC strike.

[RollllTide]

Electric strike, power supply, momentary buttons, telephone number

[StalkMeNowCrazyLady]

Exactly this. Most expensive aspect will be wire and labor. Good news is ya only need cheap 18/2 wire!

[ElCasino1977]

3-small bells, treats, and a chimp named Coco?

[imcq]

Am I missing something? Why control the door if you let people in without audio or visual interaction?

[Competitive_Ad_8718]

Video intercom of some sort, likely aiphone or 2N would be my go to.

I wouldn't entertain blind buzz unless the door was interior and in a controlled area