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6-20 WAN Screens
Advanced Modem Setup
6.10
6.10.1
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.
6.10.2
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 Contivity 221 uses this hardware signal to force the WAN device to hang up, in
addition to issuing the drop command "ATH".
6.10.3
Response Strings
The response strings tell the Contivity 221 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.
Configuring Advanced Modem Setup
6.11
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
317517-A Rev 00
specific AT commands.
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