See GSMCalls in three minutes.

Android phones, a powered USB hub and one PC. How the audio reaches the cloud, how a call flows end to end, and what the portal shows for every line.

No cables and no app on the phone. Pair Android phones, iPhones and feature phones like a car kit, and scale by adding Bluetooth adapters.

One phone and one microcontroller, with no PC. Digital audio end to end, HD wideband per line, and a chip that is locked to your platform.