A missed call is a telephone call that is deliberately terminated by the caller before being answered by its intended recipient, in order to communicate a pre-agreed message without paying the cost of a call. For example, a group of friends may agree that two missed calls in succession means "I am running late". The practice is common in South Asia, the Philippines and Africa.
A missed call is a form of pre-agreed message.
( z1 form :mod ( z2 message :ARG1-of ( z3 agree :time ( z4 before ) ) ) :domain ( z5 call :ARG1-of ( z6 miss ) ) )