Was this the step by step tones after finishing a call for all the Tennessee Telephone Company Inc. Offices

Was this the step by step tones for all Tennessee Telephone Company Inc offices in Tennessee? They all had ATT/Philps Tel 5ESS-PBX Host switches. But did they all have this step by step tones? I still wanna know what kind of off hook tone this is and what the technical name for this off hook tone is. Please let me. thank you.