Step by step tones for Telephone switch type ATT philps Tel 5ESS-PBX Host.MPG

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This was the step by step tones for telephone switch type ATT/Philps Tel 5ESS-PBX Host. The first 2 tones a...
This was the step by step tones for telephone switch type ATT/Philps Tel 5ESS-PBX Host. The first 2 tones are the same but the off hook tone at the end is different.. I still wanna know what kind of off hook tone this is and what the technical name for this off hook tone is. Please et me know. Thank you.
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