Off Hook Tone For Telephone Switch Type ATT Philps Tel 5ESS PBX Host.MPG

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This is the off hook tone for telephone switch type ATT/Philps Tel 5ESS-PBX Host. What kind of sound is thi...
This is the off hook tone for telephone switch type ATT/Philps Tel 5ESS-PBX Host. What kind of sound is this? What is the technical name for this off hook tone? Please let me know. THank you.
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