Conferencing setup

  For conferencing mode (§6.1.7) to be successful, the spock server session must be visible outside a firewall to the clients or the connection will fail. Spock uses the simple sockets library written by Dr. Charles E. Campbell at NASA's Goddard Space Flight Center, and a socket-based connection for the conference connection. Spock has been assigned port number 2507 by the internet assigned numbers authority (www.iana.org), so this port must be accesible from outside the firewall for conference sessions to be successful.