I was making a conference call with 3 people. I got the 1st 2 on the line, but when I dialed the 3rd number, I got a cell phone voicemail. I pushed the conference button to end that call and it brought me back to the dial tone. When I pushed it again, it brought me back to the 2 people and the voicemail. I pushed again and I got a dial tone. Again, and I got the 3 calls back. I needed to drop the voicemail, but it would not let me. How can I do this as it happens frequently. Please let me know ASAP because I have a meeting this afternoon. Thank you.