
The term compelled signalling refers to a class of telecommunications signalling protocols where receipt of each discrete signal needs to be explicitly acknowledged before the next signal is able to be sent. For example, in R2 register signalling, the transmission of each signal involves the following five events: The term is only relevant in the ...
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http://en.wikipedia.org/wiki/Compelled_signalling

a signalling method in which, after one signal has been sent, the sending of any further signals in the same direction is inhibited until the sent signal has been acknowledged by the receiving terminal and the acknowledgement has been received
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=714-09-20
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