Fast Busy

From NENA Knowledge Base

Fast Busy indicates the tones a caller would hear if the call could not be completed because of the lack of network resources. In NG9‑1‑1 the functional equivalent is “600 Busy Everywhere.”

Related Terms:

Fast Busy Tone, Reorder Tone

An audible tone of 120 interrupts per minute (IPM) returned to the calling party to indicate the call cannot be processed through the network.

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-INF-011, NENA NG9-1-1 Policy Routing Rules Operations Guide
  • NENA 57-001, NENA Wireless E9-1-1 Overflow, Default and Diverse Routing Operational Standard
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