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Chapter 13 – Specific AT Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 132
Alternate Line Service +WALS
Description: This command allows you to set and to get the active line. The CPHS command can be used to know
which line is active.
Values: <CmdType>
0 Set active line
1 Get active line
<Lineld> Used only for <CmdType>
1 Line 1
2 Line 2
Syntax: Command syntax: AT+WALS = <CmdType>[,<Lineld>]
Response syntax to AT+CPHS=2,3: +WALS = <Lineld>
Command Possible responses
AT+WALS? +WALS: 1
OK
Note: Display current active line
AT+WALS=? +WALS: (0-1),(1-2)
OK
AT+WALS = 0,1
Note: Activate Line 1
+WALS: 1
OK
AT+WALS = 0,2
Note: Activate Line 2
+CME ERROR: 3
Note: When the ALS feature is not allowed
AT+WALS = 1
Note: Get the current Active Line
+WALS: 1
Note: Display the current Active Line
AT+WALS = 1,2
+CME ERROR: 3
Note: Syntax error
AT+CPHS=0,3
Note: Deactivation of ALS feature
OK
Note: No effect
AT+CPHS=2,3
Note: Interrogate ALS feature
+WALS: 1
Note: Display the current Active Line
+CME ERROR: 3
Note: In the case where the ALS feature is not allowed