Green’s Dictionary of Slang

to make a call using a pager phone; also as n., a message.

1994		Source Sept. 60: I just got a beep from this lovely young lady.
1999		J. Maple Crime Fighter 97: I wanted them to beep me any time we had a homicide.
2000		P. Earley Super Casino 279: Calls came into the switchboard and the receptionist beeped the girls whenever they were needed.