Siemens TC37 Module At Command Reference page 136

AT Command Set
Reference
General remarks:
· Parameters <mt>=2,3 and <ds>=1 are only available with GSM phase 2+ (see
GSM 07.05
+CSMS=1). Incoming SMs or Status Reports have to be acknowledged with
AT+CNMA=0 when using these phase 2+ parameters.
· The parameters <ra> and <tora> will only be displayed if AT^SSCONF=1 has
been set before. See Chapter 6.37 for details on AT^SSCONF.
Handling of Class 0 short messages:
· If the host application is provided with a display and AT^SSDA=1 has been set
Class 0 short messages can be displayed immediately. Refer to Chapter 6.38
for details.
· If the host application does not include a display, ME handles Class 0 short
messages as though there was no message class, i.e. it will ignore bits 0 and 1
in the TP-DCS and normal rules for exceeded memory capacity shall apply.
This approach is compliant with GSM 03.38.
Requirements specific to Multiplex mode:
· In multiplex mode (AT+CMUX=0) only one channel can use a phase 2+
parameter. The parameter for <mt> and <ds> on the other channels have to be
set to zero.
· If either a SM or a Status Report is not acknowledged, all +CNMI parameters
will be set to zero on all channels.
TC3X_ATC_01_V04.00 Page 136 of 204 29.05.2002