ZyXEL Communications Omni TA128 - Manual (Page 61)

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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.
2. Issue the command
AT*D0
To set phone number 0 as the DTR drop destination phone
number.
3. Issue the command
AT&D1
Enable DTR dialing operation.
4. Turn the TA off and back on.