Telephone step by step tones in Concord/Farragut TN

This was the step by step tones out in Concord/Farragut TN. It was with this phone company call Concord Telephone Exchange Inc. The first 2 tones ate the same. but the off hook tone is different at the end. What kind of off hook tone is this? What is the technical name for this off hook tone? Please let me know. Thank you.