Call collision

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In telecommunications, a call collision (also known as a glare, though this term is deprecated) is one of two things:

  1. The contention that occurs when a terminal and data circuit-terminating equipment (DCE) specify the same channel at the same time to transfer a call request and handle an incoming call. When call collision occurs, the DCE proceeds with the call request and cancels the incoming call.
  2. The condition that occurs when a trunk or channel is seized at both ends simultaneously, thereby blocking a call.

This article contains material from the Federal Standard 1037C (in support of MIL-STD-188), which, as a work of the United States Government, is in the public domain.

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This is prevented from happening when ground start trunking is utilized. IE: Nortel BSP discourages using loop start trunks for this and other reasons.

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