Dial-in Additional Participants in Group Calls w/o Leaving Lengthy Voicemails When They Don't Answer

When involved in a group call, we often time would like to add a new participant and will do so by dialing them in. If they pick up, all works well. If they do not pick up and it instead goes to their voicemail, I do not know how to hang up on just them to prevent leaving a lengthy voicemail. The options at this point seem to be to end the call for everybody or stay on the call and have the voicemail pick up the remainder of the call, neither of which seem like good options.