an existing telephone cable is sometimes usable, but the type of cable and its condition determine whether the picture, sound and door opening remain reliable.
In older homes, two-wire wiring is often used between the outside post and the inside doorbell. This route can be valuable, but a cable that once only powered a bell is not automatically suitable for a video intercom.
Check where the cable starts and ends, how many wires are available, and whether there are welds or unknown modules along the way. Not only measure whether there is voltage; the manufacturer's method must match the route.
Only then choose a two-wire solution, an IP outdoor post with a new cable or a standalone smart doorbell. A clean choice prevents emergency solutions behind the outdoor post.
Test calling, two-way communication, video call, and the door opener while all indoor posts can be used simultaneously. Record the used addresses and power supply times for later maintenance.
No. The suitability depends on the cable type, length, condition and the chosen intercom system.
No. First research prevents unnecessary breaking work and also unreliable reuse plans.
