ZyXEL Vantage CNM User Guide - Page 98

Chapter 5 Device Network Settings 5.3.5 Advanced Modem Setup (ZyNOS ZyWALL) 5.3.5.1 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. 5.3.5.1.1 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 device uses this hardware signal to force the WAN device to hang up, in addition to issuing the drop command ATH. 5.3.5.1.2 Response Strings The response strings tell the device 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 Advanced button in the Advanced Modem Setup in the Dial Backup screen to display the Dial Backup Advanced screen shown next. 98 Vantage CNM User's Guide