I-Trac AS2000 Plus User Manual page 12

Turn off acc alarm SMS: 887+user password
Eg: 8870000
Turn on acc alarm phone call: 888+user password
Eg: 8880000
Turn off acc alarm phone call: 889+user password
Eg: 8890000
8.14. Sleep Mode:
Turn on sleep mode:
SLEEP+user password+space+X
X means sleep time, from 1-720, in the unit of minute. If device not receive any command or
move at the X time you set, device will close GPS,GSM module, and be in power saving mode.
Eg：SLEEP0000 1
Reply：SET OK
Turn off sleep mode:
SLEEP+user password+space+0
Eg：SLEEP0000 0
Reply：SET OK
8.15. Voice monitoring(Available for MT1X only)
Command:66
Reply:set ok
Description:
You need to set admin number first, then send 66 command from admin number to the gps tracker,
after receiving the command from admin number, gps track will call admin number automatically
to realize the voice monitoring function.
8.16. Set Access Point Name (APN)
Command1： 803+user password+space+APN
eg：8030000 CMNET
Command2 : 803+user password+space+APN+space+APN user name+space+APN Password
Reply: SET GPRS APN OK