Specifications

Chapter 9 – Supplementary Service Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 129
Chapter 9 – Supplementary Service
Commands
The AT Commands described in this chapter are related to the Supplementary Services offered by the GSM network.
9.1 AT+CACM Accumulated Call Meter (ACM) Reset / Query
Description: The read command returns the current ACM value.
The write command resets the Advice of Charge related to the accumulated call meter (ACM)
value in SIM file EF(ACM). ACM contains the total number of home units for both the current and
preceding calls.
Syntax: Test Command: AT+CACM=?
Response: OK
Read Command: The read command returns the current ACM value. AT+CACM?
Response: +CACM: <acm>
OK
ERROR
+CME ERROR: <err>
Write Command: AT+CACM=[<passwd>]
Response: OK
ERROR
+CME ERROR: <err>
Parameter:
<acm>
Three bytes of the current ACM value in hexadecimal format (e.g., “00001E” indicates decimal value 30) 000000
- FFFFFF.
<passwd>
SIM PIN2
Notes:
• This command is PIN protected. This command is available after PIN2 authentication. See +CPIN2.
• This command is supported in airplane mode.
9.2 AT^SACM Advice of Charge and Query of ACM and
ACMmax
Description: The execute command can be used to query the current mode of the Advice of Charge
supplementary service, the SIM values of the accumulated call meter (ACM), and the
accumulated call meter maximum (ACMmax).
The write command enables or disables the presentation of unsolicited result codes to report
the call charges.
Syntax: Test Command: AT^SACM=?
Response: ^SACM:(list of supported <n>s)
OK
Exec Command: AT^SACM.
Response: ^SACM: <n>, <acm>, <acmMax>
OK
ERROR
+CME ERROR: <err>
Write Command: AT^SACM=<n>.
Response: OK
ERROR
+CME ERROR: <err>