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74 536EX Chipset Developer’s Manual
Intel Confidential
IS-101 Voice Mode AT Commands
+VEM=m see ‘m’
Event Reporting and Masking: This command selects which detection events are supported in voice
mode. Each event is represented by a single bit of a four-digit hex number (see the following table).
Setting an event number bit to 0 means that event is not reported. Setting a bit to 1 indicates that a
detected event is reported. While the event settings affect all modes (that is, playback, record, and
command modes), not just voice command mode, the mask can be changed each time the mode is
changed. Not all events are supported in each mode. See the following table for supported events.
This modem supports more features than an IS-101 Class C-compliant modem. (Class C is the highest
IS-101 compliant modem, and Class A is the lowest.) See the following examples for more information.
m = <mask>
Defaults = ‘C’, BB860980, BFE63883, BB863EE0
Table 25. Voice Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.
Hex Digit
Location
Event
Number
(Bit Number)
Event Description DCE Voice Mode(s)
1 0 Caller ID report Command
1 Reserved
2 Distinctive ringing All
3 * RING All
2 4 * DTMF received All
5 * Receive buffer overrun Receive
6 * Fax calling (for example, 1100 Hz) All
7 Data calling (for example, 1300 Hz) All
3 8 Local phone on/off hook All
9 * Presumed hang-up (SILENCE) time-out Receive
10 *
Presumed end of message (QUIET) time-
out
Receive and command
11 Reserved
4 12 Reserved
13 Loop current interruption All
14 Loop current polarity reversal All
15 Reserved
5 16 Reserved
17 Reserved
18 * Ringback/remote ring All
19 * BUSY reorder/fast busy Receive and Command
6 20 * DIALTONE Receive and Command
21 Reserved
22 Reserved
23* Transmit buffer under-run Transmit
7 24 Extension phone on/off hook All
25 * Fax or data answer (for example, 2100 Hz) Command
26 Data answer (for example, 2225 Hz) Command
27 Reserved
8 28 Reserved
29 Reserved
30 Reserved
31 Reserved
32 Reserved
33 Reserved
34 Reserved
35 Reserved
NOTES:
• Items marked with an asterisk (*) meet IS-101 Class C specifications.
• All: Playback, record, and command modes.