3Com 3C10200 NBX Installation Guide - Page 117

Connecting Telephone Lines 117 3 Click on the Extension column heading to sort the list by extension from the lowest extension. Click the heading again to sort from the highest extension. 4 Review the extensions in the list to find the highest extension number that has been assigned. Add one to that extension and record it. For example, if the highest assigned extension number is 7268, you record 7269. 5 Click PSTN Gateway Configuration > Analog Line Cards. 6 From the four Line Card ports you recorded, click the extension number of the port with highest MAC address or port number to open the Modify screen. 7 Change the extension number (7258 in this example) to the extension number you recorded when you were viewing the Device List tab (7269). 8 Click OK. The Line Card Ports tab reappears showing the new extension number. Extension 7258 is now unused. 9 From the four Line Card Ports you recorded, select the port to which you want to assign the unused extension. In the example, 7258 is the lowest extension number of the four, so select the port with the lowest MAC address or port number and click its extension. 10 Change the extension number and click OK. Repeat steps 9 and 10. Each time that you assign an extension, the previous extension is no longer used, and you can assign it to the appropriate port. When you are finished: ■ The four original extensions (7258 through 7261) are assigned to the line card ports in the same order as the MAC addresses or port numbers. ■ The unused extension (7269) is again unused. Connecting Telephone Lines After you have installed and configured the system for initial startup, connect the telephone company lines to the analog line ports so that you can start receiving outside calls. Adding External Hardware External devices connect to the front of the NBX system. See "What External Devices Can Connect to an NBX System?" on page 83.