Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 132)

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:
0 Set active line
1 Get active line
Used only for
1 Line 1
2 Line 2
Syntax: Command syntax: AT+WALS = [,]
Response syntax to AT+CPHS=2,3: +WALS =
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