Specifications

Chapter 9 – Supplementary Service Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 119
9.13 AT+CSSN Supplementary Service
Notifications
Description: The write command enables or disables the presentation of URCs for supplementary
services.
Test Command Syntax: AT+CSSN=?
Response: +CSSN: (list of supported<n>s), (list of supported<m>s)
OK
Read Command Syntax: AT+CSSN?
Response: +CSSN: <n>, <m>
OK
Write Command Syntax: AT+CSSN=<n>[, <m>]
Response: OK
ERROR
+CME ERROR
Parameter Descriptions:
<n>
0 Suppress “+CSSI” URCs. Default.
1 Activate “+CSSI” URCs
<m>
0 Suppress “+CSSU” URCs. Default.
1 Activate “+CSSU” URCs
<code 1>
0 unconditional call forwarding is active
1 some of the conditional call forwardings are active
2 call has been forwarded
3 Waiting call is pending
<code 2>
0 The incoming call is a forwarded call.
5 Held call was terminated
10 unconditional call forwarding is active
Unsolicited Result Codes:
URC 1
+CSSI: <code 1>
When <n>=1 and a supplementary service notification is received after a mobile originated call setup,
intermediate result code “+CSSI: <code 1>” is sent to TE before any other MO call setup result codes.
URC 2
+CSSU: <code 2>
When <m>=1 and a supplementary service notification is received during a mobile terminated call setup or
during a call, unsolicited result code “+CSSU: <code 2>” is sent to TE.
Note: URCs will be displayed only if the call concerned is a voice call, but some URCs will be displayed as well as for
data calls (like “+CSSU”=0).