Was this the off hook tone for Parson Greene Telephone Exchange Inc. in Parson TN

Was this the off hook tone for Parson Greene Telephone Exchange Inc. in Parson TN? They had ATT/Philps Tel 5ESS-PBX Host Switches. But did they have this off hook tone? I still wanna know what kind of off hook tone this is and what the technical name for this off hook tone was. Please let me know. Thank you.