NAK (Negative Acknowledgement)

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A NAK (Negative Acknowledgement) character indicates that a message, block, or frame has been received in errored condition across a communications circuit, and that it must be retransmitted.

Also known as:

NACK

Relevant NENA Documents
Note: To find and download the document, copy the document number (like NENA-STA-010) from below and search the NENA Standards and Documents page.

NENA-STA-027, NENA E9-1-1 PSAP Equipment Standards

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