OCW - The time (usually expressed in seconds) that the longest waiting-call in a given queue has been waiting. This is sometimes referred to as simply 'Oldest Call'. It is also occasionally referred to as the 'Longest Call Waiting' (LCW), or the ‘Oldest Call In Queue’ (oddly enough, this most descriptive moniker is also the least popular). In some applications where display area is limited (readerboards for example) it may also be abbreviated to 'OLD'.