User's Manual

10
1800 Hz
1440 Hz
900 Hz
450 Hz
1 sec.
DEEP
HIGH
HIGH DUAL
DEEP DUAL
BUSY
READY
CONNECTION
WAITING FOR
NON
EXISTING
RECEIVING CALLS
TRANSMITTING CALLS
36329
ALTERNATING
SLOW
ALTERNATING
FAST
Appendix A
Tone Signalling