This command allows a user, regardless of how access to the mailbox was made,
to make an outbound AX25 call. The format of the command is as follows:-
G <interface> <target callsign> [digipeater] [digipeater] .... [digipeater]
The interface on this node is called 'tnc' but may differ between stations.
Use the configurable escape key to exit the session. CTRL-X is the default.
