Furuno Felcom 50 Operator's Manual page 126

6. DATA COMMUNICATION
Switching between MPDS and ISDN mode
The connection window provides sensing on the telephone number.
If dialing an international number instead of **94#, the terminal switches back to
ISDN mode of operation.
Examples:
Dialing
(no subscriber number is sent to the Net provider).
Dialing
6-36
**94#
004766850170
MPDS via default Net service provider
Note: Hash # may be omitted on some
PCs/Windows versions.
ISDN mode.