ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

159 

Chapter 7 WAN Screens

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. 

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.

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.

Click the Edit button in the Dial Backup screen to display the Advanced Setup screen. 

Note: Consult the manual of your WAN device connected to your dial backup port for 

specific AT commands.

Apply

Click Apply to save your changes back to the ZyWALL.

Reset

Click Reset to begin configuring this screen afresh.

Table 43   Dial Backup (continued)