Make "Offline" Calls Between Landline Telephones - no Phone Network

In this video, I show how to create a standalone telephone system using two regular landline phones and a single analog telephone adaptor (ATA). The phones behave exactly like real telephones — you get a dial tone, ringing, and proper call connection — but everything works completely offline!

This setup is perfect for making a on-stage telephone ring as a theatre prop, for escape rooms, museum or art exhibitions, intercoms or creative projects where you want a create a working phone call between two phones without needing a telephone network or the internet. And no hardware modifications or coding required :)

I demonstrate the full configuration using a Grandstream HT-802 ATA, including how to set up internal dialing, optional auto-dial (intercom-style operation), and how to enable static IP so that the system runs completely standalone once configured.

More details about all of the projects featured on this channel can be found at Patreon:   / playfultech  
And you can join the discussion on the Discord:   / discord  

Timings
00:00:00 - 00:01:00 Introduction and Demonstration
00:01:01 - 00:04:16 Hardware
00:04:17 - 00:11:42 HT-802 Configuration
00:11:43 - 00:12:30 Wrapup