I have joined the ARISS Program as a Mentor to help schools make contacts with astronauts on the International Space Station (ISS). School contacts as part of the ARISS program can take two forms – Direct Contacts and Telebridge Contacts. We have recently added Phone Patch capability to the Satellite Ground Station here….
Source: Satellite Station 4.0 Part 11 – Phone Patch/Telebridge Capability
Did you ever wonder how a Telephone Patch device is used? Back in the day, it was common for Amateur Radio operators to help families talk to their relatives and service members overseas over the air. This was done by first establishing a radio link to a foreign Amateur Radio station. Next, the Hams involved connected third party family members to each other via local telephone connections so they could speak.
A device called a Phone Patch was used to make the connections between the Amateur Radio Transceivers and the local telephone lines.
Out Of This World Phone Patch

We still use Telephone Patch devices to enable Schools to make contact with the International Space Station. This type of contact is called a Telebridge. A school can make a Telebridge Contact with an astronaut on board the ISS using a telephone connection to an Amateur Radio Ground Station in a different location. A Phone Patch is used to make the connection between the school and the remote Ground Station.
We’ve added a Phone Patch to our Satellite Station here to support our work with ARISS. We will use it to test school audio systems as they prepare to make contact with the ISS via Telebridge. Click on the link above to learn more about how a Phone Patch is used to make a Telebridge Contact.
Fred, AB1OC