Various embodiments of the invention provide a Peer-to-Peer telephone system. When the designated routing device detects that an MCDN network connection to an IPTV multicast source is unavailable, the designated routing device reduces its designation priority to a lower value. A connecting member is formed integrally in the insulating member, and arranged to electrically connect inner ends of the first and second windings to form a single continuous winding. The composite material is suitable for being used as electrode in an electrochemical cell.