Step by step tones for Telephone Switch type ATT/Philps Tel 5ESS-PBX Host

This is the step by step tones for Telephone Switch Type ATT/Philps Tel 5ESS-PBX Host. THe first 2 tones are the same but the off hook tone is different at the end. I still wanna know what kind of off hook tone this is and what the technical name for this off hook tone is. Please let me know. Thank you.