Disengagement originator
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In telecommunication, disengagement originator is the user or functional unit that initiates a disengagement attempt.
Note 1: A disengagement originator may be the originating user, the destination user, or the communications system.
Note 2: The communications system may deliberately originate the disengagement because of preemption or inadvertently because of system malfunction.
Source: from Federal Standard 1037C