Off-hook tone (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Off-hook tone" in English language version.

refsWebsite

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telcordia.com

telecom-info.telcordia.com

Telcordia GR-506-CORE Issue 3 December 2011, Signaling for Analog Interfaces, Section 17.2.8 Receiver-Off-Hook (ROH) Tone