In short
A 2-wire video intercom uses two wires for power, audio, video and door release, so it usually reuses an old intercom’s wiring and avoids works. An IP video intercom uses network cable and is more flexible and integrated, but normally needs new cabling. Both can forward calls to your phone.
Comparison
| Aspect | 2-wire | IP |
|---|---|---|
| Cabling | Reuses two existing wires. | Network cable to each monitor. |
| Works | Minimal in upgrades. | Usual if there is no existing network. |
| Calls on your phone | Yes, with a networked monitor or module. | Yes, natively. |
| Integration | Good with the rest of the ecosystem. | Highest: cameras, access, automation. |
| Best for | Upgrading existing homes and buildings. | New builds and buildings with structured cabling. |
Before upgrading an apartment building
- Check how many wires reach each flat and their condition.
- Count flats, entrances and whether there is a concierge.
- Decide whether calls can be answered on phones and who manages users.
- Plan garage and pedestrian door release from the same system.