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Flow Control
XON/XOFF flow control is used by the modem to match the PC-to-modem data rate to the line-signaling
rate, as well as to the requirements of analog conversion of the voice signals and voice data.
In-band, uni-directional XON/XOFF flow control is mandatory. RTS/CTS (V.24 circuits 106 and 133) flow
control is optional per the IS-101 standard.
Voice Mode Result Codes
In Voice mode, the modem can detect and report DTMF, detect call progress tone and cadence events,
evaluate voice quality, and can monitor Telco-related activities. Events can be reported as a single
character (Simple or "Terse" reporting), a full-text message (Message or "Verbose" reporting), or as a
repeating pattern (Pattern reporting).
Terse Verbose
0
Caller ID Report
1
DID Report
2
Distinctive Ringing
3
RING
4
DTMF Received
5
Receive Buffer Overrun
6
Facsimile Calling (e.g., 1100 Hz)
7
Data Calling (e.g., 1300 Hz)
8
Local Phone On/Off Hook
9
Presumed Hang Up (SILENCE) Time-out
10
Presumed End of Message (QUIET) Time-out
11
SIT Tone (CO Standard Information Tones, sent to pay phones)
12
Bong Tone (Calling Card Tone)
13
Loop Current Interruption
14
Loop Current Polarity Reversal
15*
Call Waiting Beep/Interrupt*
16*
Distinctive Call Waiting*
17*
TDD Detected (e.g., 1400/1800 Hz)*
18
Ring Back/Remote Ring
19
BUSY
20
DIALTONE
21
Reorder/Fast Busy
22
V.21 Channel 2 7E Flags
23
Transmit Buffer Under Run
24
Extension Phone On/Off Hook
25
Facsimile or Data Answer (e.g., 2100 Hz)
26
Data Answer (e.g., 2225 Hz)
27
Voice Detect
28
Call Waiting Plus Caller ID
29
Stuttered Dial Tone
30
Invalid Voice Data Format
31
Lost Data Detected Event
32
Facsimile Answer
33-63 Reserved for future standard
above 63
Manufacturer specific
_____
* Further study required for final specification.
The TIA/EIA-602 CONNECT result code is disallowed in voice mode.
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434D)
Chapter 4 – Voice Commands
57
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