70 Tel-Site System Management Application
TVS Modem Shares a CO Line Connection (off-site access)
Sharing a CO line for a connection is a common way to access remote sites. This section describes
the TVS configuration required for a successful connection. In addition, you learn why Tel-Site uses
DISA (Direct Inward System Access) accounts and where to enter that information.
Note The modems used for shared CO connections must support partial dialing. Partial dialing
enables Tel-Site to dial the customer site, delay long enough for the TVS to answer, and
then send a Direct Inward System Access (DISA) logon password to complete the
connection. For more information, see the Modem Properly Installed topic in the Tel-Site
Help menu.
About Direct Inward System Access (DISA)
The TVS Modem Shares a CO Line connection uses DISA (Direct Inward System Access) as part
of its logon to the system. DISA is a way to gain access to the internal dial tone of the VS1
telephone system from an external phone not connected to the system. For example, you are off-site
and want to access an outside line from the office. You perform the normal DISA steps of pressing
#, then your extension, and then your DISA account.
DISA for the Tel-Site application uses the same procedures as normal DISA activity. The only
difference is that Tel-Site performs the steps automatically to connect.
TVS Configuration
For TVS Modem Shares a CO Line connection, the following steps must be completed:
• Configure the TVS modem to not answer the Tel-Site modem call.
• Enable DISA on the CO port connected to the TVS modem.
• Set up a DISA account on an extension port type
With the site open through Tel-Site, click the VS1 Editor button in the Configuration window.
This opens the VS1 Editor configuration program to make the above changes.
Configure the TVS modem to not answer the Tel-Site modem call
1. In the Tree Control display, click System Configuration 2.
2. In the Init String: text box, replace the current S0=[n] with S0=0 at the end of the modem
initialization string. (Typing S0=0 sets the modem so that it does not answer.)
3. Click the Save button in the toolbar.
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