Yes, you can use the central button on the H3000 earcup to answer, reject, or end a call:
1) Incoming calls
• Press for 1 second to answer the call
• Press for 2 seconds to reject the call
2) During a call
• Press for 1 second to end the call
Note:This works for general HFP calls and Microsoft Teams calls but might not work for call services provided by other meeting or calling applications.