Setting Up the G24 (Power On and Initial Actions)
4-2 AT Commands Reference Manual June 30, 2008

Figure 4-2: Detailed Phone State Transactions

ReadyGPRS VoiceCSD Data
GPRS seq.
AT*99#
OK (connecting)
DTR(2)
ATO
DTR(1)
ATH
NO CARRIER
NO CARRIER
ATH
ATO
+++/DTR OK (connecting)
ATD
RING/ATA
ATH/
NO CARRIER
ATD
RING/ATA