Siemens 1800C - Manual (Page 86)

8 - 8 A U T O D I A L N U M B E R S A N D D I A L I N G O P T I O N S
Tone/Pulse
If you have pulse dialing service, but need to send tone signals (for example, for
telephone banking), follow the directions below. If you have touch tone service,
you do not need this feature to send tone signals.
1
Lift the handset.
2
Press #. Any digits dialed after this send tone signals.
3
When you hang up, the fax machine returns to pulse dialing service.