ZyXEL Communications omni series user manual DTR Drop-Dialing Operation, Indicator Messages

Command Messages

RST

Changes to asynchronous AT command mode.

Indicator Messages

CNX	Call connect.
INC	Incoming call.
VAL	Valid command.
INV	Invalid command.
CFLxx	Call Failure.
NT	Answer tone is not detected.
AB	Abort call.
ET	Engaged tone.
NS	Number is not stored.
RT	Ring tone.

DTR Drop-Dialing Operation

The omni will automatically dial the phone number stored in the NVRAM when it detects an off-to-on transition of the DTR line. Before you enable the DTR drop action, a phone number must be stored and saved to memory along with an indication of which number to dial on DTR drop. First use AT&Zn=s (n=0-39, s=phone number) to store the phone number into NVRAM. Then, use AT*Dn (n=0-39) to choose which of the in-memory phone numbers should be dialed. Finally issue an AT&D1 to enable DTR drop dialing operation.

ONote: Phone numbers must include a prefix for specific call types, e.g. I for ISDN.

An example of DTR drop dialing is given below. The destination phone number is 5551234.

1.Issue the command

AT&Z0=I5551234

to save phone number to NVRAM.

54 V.110 and Synchronous Mode Communications