ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 117)

ZyWALL 10~100 Series Internet Security Gateway
WAN Screens 8-21
8.10 Advanced Modem Setup
8.10.1 AT Command Strings
For regular telephone lines, the default “Dial” string tells the modem that the line uses tone dialing. “ATDT”
is the command for a switch that requires tone dialing. If your switch requires pulse dialing, change the string
to “ATDP”.
For ISDN lines, there are many more protocols and operational modes. Please consult the documentation of
your TA. You may need additional commands in both “Dial” and “Init” strings.
8.10.2 DTR Signal
The majority of WAN devices default to hanging up the current call when the DTR (Data Terminal Ready)
signal is dropped by the DTE. When the “Drop DTR When Hang Up” check box is selected, the ZyWALL
uses this hardware signal to force the WAN device to hang up, in addition to issuing the drop command
“ATH”.
8.10.3 Response Strings
The response strings tell the ZyWALL the tags, or labels, immediately preceding the various call parameters
sent from the WAN device. The response strings have not been standardized; please consult the
documentation of your WAN device to find the correct tags.
8.11 Configuring Advanced Modem Setup
Click the Edit button in the Dial Backup screen to display the Advanced Setup screen shown next.
Consult the manual of your WAN device connected to your dial backup port for
specific AT commands.