120First-aid call center

a call of nature

a call to arms

a close call

a duty call

a house of call

abandoned call

abbreviated address call

abbreviated call

abbreviated call letters

abnormal function call

accept the call

Access and Call Control Function ACCF

acoustically tunable optical filterautomatic call sequencer

acrylateautomatic call sequencer

ACSautomatic call sequencer

adaptive partial call chain

additional call library

additional port of call

advance call