GSM Modules
15
AT+CCWA=[<n>]
[,<mode>
[,<class>]]
Call waiting setting
As mode!=2, if succeeded,
OK
As mode==2, return:
+CCWA:<status>,<class1>[<CR><LF>
+CCWA:<status>,<class2>[...]] OK
If operation error occurs:
+CME ERROR: <err>
If <n>=1, send call waiting result code:
+CCWA: <number>,<type>,<class>
[,<alpha>][,<CLI validity>]
Under the premise of call waiting activated,
in the process of call connection,
As the system terminates the call, actively
send the result code.
Parameter <n>
0
：
do not send the result code of call waiting;
1
：
send the result code of call waiting
<mode>
0
：
Deactivate call waiting;
1
：
call waiting;
2
：
check current status
<class> 1
：
voice call
<status> 0
：
deactivated
；
1: activated.
<number> call waiting number, designated by <type>
<type> <number> format
<alpha>,<CLI validity>
见
AT+CLIP
1.22 +CHLD: call held
Description
This command is used to set call held and conference call.
Format
AT+CHLD=[<n>]
AT+CHLD=?
Check supported <n>
+CHLD: (list of supported <n>s )
OK
Example
AT+CHLD=[<n>]
Set call held and conference call.
If settings succeed
：
OK
If operation error:
+CME ERROR: <err>
