Type:

Northern Telecom 228A “Dial-less Subset” wall phone, with matching Trimline-style handset.

🔹 Purpose:

They were used in PBX, hotel, office, or intercom systems, where the user never dialed directly.
Instead, the phone:

• Connected to a switchboard or private branch exchange (PBX).

• Could be picked up to reach an operator, or used to answer a specific line.

• Sometimes had buttons or selectors on a separate console for dialing or line access.