- Call collision
telecommunications, a call collision (commonly known as glare) is one of two things:
contentionthat occurs when a terminal and datacircuit-terminating equipment ( DCE) specify the same channel at the same timeto transfera callrequest and handle an incoming call. When call collisionoccurs, the DCE proceeds with the call request and cancels the incoming call.
#The condition that occurs when a
trunkor channel is seized at both ends simultaneously.
If you have ever tried to make a call out on a PBX, and been accidentally connected to an incoming call, you have experienced glare. This can sometimes happen at home too, if you pick up your phone to make a call out at the exact second that a call is about to start ringing in.
Multi-line huntinggenerally avoids glare by picking trunks in opposite preference order so the highest numbered line, which is last choice for incoming calls, is first choice for outgoing calls, like so:incoming-->1 2 3 4 5 6 7 8<-- outgoing
For PBX trunks, glare can further be reduced by using
ground starttrunking. IE: Nortel BSP discourages using loop starttrunks for this and other reasons. Long Distance exchanges in the 1950s and 60s incorporated Glare Detectors to alleviate the problem.
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