Call Control
3-50  G24-L AT Commands Reference Manual April 15, 2008
Supplementary Services
This set of commands enables control over supplementary service notifications, including 
Structured and Unstructured Supplementary Service Data (USSD) data.
+CSSN, Supplementary Service Notifications
This command handles the enabling and disabling of supplementary service-related, 
network-initiated, notifications.
Command 
Type
Syntax Response/Action Remarks
Set
+CSSN=[<n>[,<m>]] OK
+CME ERROR: <err>
The Set command enables/disables the 
display of notification result codes to 
the TE.
When <n>=1 and a supplementary 
service notification is received after a 
mobile-originated call setup, the 
+CSSI: notification is sent to the TE 
before any other mobile-originated call 
setup result codes. When several 
different notifications are received 
from the network, each of them 
receives its own +CSSI result code.
When <m>=1 and a supplementary 
service notification is received during 
a mobile-terminated call setup or 
during a call, or when a forward check 
supplementary service notification is 
received, the unsolicited result code 
+CSSU: is sent to the TE. In case of a 
mobile-terminated call setup, a CSSU 
is sent after every +CLIP result code 
(“+CLIP, Calling Line Identification” 
on page 3-19). When several different 
events are received from the network, 
each of them receives its own +CSSU 
result code.
Note:
The values for <n> and <m> 
are not saved after power 
cycle.
Read
+CSSN? +CSSN: <n>,<m>
The Read command displays the 
current supplementary service 
notification setting.
Test
+CSSN=? +CSSN: (0-1), (0-1)
The Test command displays the list of 
supported CSSN values.