Specifications

TC35i AT Command Set
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TC35i_ATC_V01.05 Page 205 of 278 04.08.2003
7.17 AT^SM20 Set M20 Compatibility
Test command
AT^SM20=?
Response
OK
Read command
AT^SM20?
Response
^SM20: <CallMode>,<CmgwMode>
OK
Parameters
See write command
Write command
AT^SM20=
<CallMode>
[,<CmgwMode>]
M20 is an earlier, widely used SIEMENS GSM engine. The AT^SM20 com-
mand selects different modes of responses returned upon execution of the two
commands ATD and AT+CMGW. Please note that the AT^SM20 command has
no effect on any other features and is not intended to adjust other differences
between M20 and TC35i.
OK
Parameters
<CallMode> Call setup response mode (numeric). Applies only to voice
calls.
0 Set compatibility to Siemens mobile phones.
ME will return “OK” immediately after attempting a call
with the ATD command. In case of failure, additional call
release indications, such as “NO DIAL TONE, “NO
CARRIER”, “BUSY” will follow.
1 Default call setup mode, compatible to M20.
ME will return “OK" in case of a successful connection,
otherwise one of the call release indications “NO DIAL
TONE, “NO CARRIER”, “BUSY” are indicated.
Note: If ATD is used while there is already an active call, then
“OK” will always be presented immediately after dialing was
completed, regardless of the settings selected with
AT^SM20. See notes and example given in Chapter 2.5
<CmgwMode> Response mode for sending and writing short messages
(numeric).
Applies to the commands AT+CMGS and AT+CMGW com-
mand. See also Chapters 5.6 and 5.7 for more details.
0 Set compatibility to Siemens mobile phones.
ME will return +CMS ERROR: <err> when writing or
sending of short messages fails. See Chapter 8.1.2 for a
list of result codes.
1 Default mode for sending and writing short messages,
compatible to M20.
ME will return “OK”, no matter whether or not AT+CMGS
or AT+CMGW was successfully executed.
Reference
Siemens
Note