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 mutual agreement to convey a message. 
( z1 mean :ARG1 ( z2 call :ARG1-of ( z3 miss ) ) :ARG2 ( z4 agree :ARG1 ( z5 convey :ARG1 ( z6 message ) ) :mod ( z7 mutual ) ) )