I just upgraded to Communication Manager 12.22 and trying out the EC500. It calls our Nextel cell phones which are the i60c's. The problem is if you choose not to answer the EC500 call once you opened the phone and close it, or you press no to receiving the call, it goes to the Nextel voice mail and not back to the phone switch. Has anyone else experienced this and had a solution. Can I get Nextel to change something for me.