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. The first tone is the same but the off hook tone is different. I still wanna know what kind of off hook tone that was and what the technical name for this off hook tone is. Please let me know. Thank you.