Step by step tones after finishing a call for Concord Telephone Exchange Inc. in Concord TN

This was the step by step tones after finishing a call for Concord Telephone Exchange Inc. in Concord TN. In my other videos I did the ones that when you pick up the phone and don't dial out and just leave the phone off the hook for a long time. The first tone is the same but the off hook tone at the end is different. I still wanna know what kind of off hook tone this and what the technical name for this off hook tone is. Please let me know. Thank you.