Transitioning a telephone network phone call to a video call

The present disclosure relates to systems, methods, and devices for transitioning phone calls to video calls. Specifically, one or more embodiments allow users to transition from an active phone call over a telephone network to a video call. One or more embodiments determine a first user identifier for a first user and a second user identifier for a second user. Additionally, the systems and methods identify user client devices actively performing the phone call based on the user identifiers and provide an option to the identified client devices to switch the phone call to the video call. Transitioning the phone call to a video call involves generating a null connection prior to selection of the option to transition to the video call and then streaming media between the client devices using the generated null connection in response to selection of the option.