Was this the off hook tone for Halls Telephone Exchange Inc.

  Was this the off hook tone for Halls Telephone Exchange Inc. in Halls Crossroads 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 ton e this is and what the technical name for this off hook tone is. Please let me know. Thank you.