Telephone Intercom System (Stage Telephone Ringer). Dubbed "Exchange in a Box" This Plug and Play solution is designed to make telephone calls between two hard-wired UK telephones. Ideal for use as an internal intercom system or as a method of making prop telephone calls for Stage and Screen. Operates from a 12V DC supply (provided) and will ring both new and vintage telephones (will ring a REN of 3).

We strongly advise you watch the video below in its entirety before purchasing this solution.



Only Available in the UK and must be posted to a confirmed (same as credit card address) UK address
The telephones (not provided) just plug into the "standard BT style telephone sockets" (provided). The system includes two telephone wires (one 12 meters and one 3 meter in length). However standard telephone extension cables can be used to extend the range by up to 100 meters if required.


Write a review

Please login or register to review

Telephone Intercom System

  • Brand: OLD BT Telephones
  • Product Code: Exchange in a Box
  • Availability: Out Of Stock
  • £97.50


Tags: intercom telephone

Please Follow us on