Thank you for asking this question in the support community. If the AOS unit is configured for Voice Quality Monitoring (VQM), then a command to view active calls is show ip rtp-quality active-calls. However, at the time of this post, I cannot think of a recommended way to terminate only a specified active call, without terminating all calls.
Please, do not hesitate to reply to this post with any additional questions. I will be happy to help in any way I can.