Motorola SM56 manual Busy

Bit	Signal
3	RING
4	DTMF Detection
5	Receive Buffer Overrun
6	Fax Calling
7	Data Calling
8
9	Presumed Hang-Up (SILENCE) Time-Out
10	Presumed End-of-Message (QUIET) Time-Out
11
12
13
14
15
16
17
18	Ring Back
19	BUSY
20	DIALTONE
21
22
23	Playback Buffer Underrun
24
25	Fax or Data Answering Modem Detected
26
27	Voice Detected
28
29
30
31
32

39