The most common way to
sign "video phone" is to simply spell VP:
Another way to sign "video-phone" is based on the idea of two cameras
facing opposite directions, actively recording. This version is
also sometimes used to mean "video-relay" as in a video relay
interpreting service (such as "Sorenson" or "Purple Communications")
that Deaf people use to call Hearing people.
VIDEO-PHONE (video relay)