What is prefix for call?

There isn't a single, universally recognized prefix for "call." The closest thing would be "tele-," which is used in words like "telephone," "telecommunications," and "teleconference," but it specifically refers to communication at a distance, not just the act of calling.

There are also other prefixes used in specific contexts:

* "voice-" can be used to describe a call specifically using one's voice, like "voice call" or "voicemail".

* "video-" is used for calls that include visual elements, like "video call" or "video chat".

* "audio-" is used for calls that only involve sound, like "audio call" or "audio conferencing".

The best prefix to use depends on the specific context and what you want to emphasize.