3Com 2102PE Phone Guide - Page 74
Dialing a Call to a Remote Office, Using Unique Extensions, Using Site Codes
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74 CHAPTER 7: GETTING MORE FROM YOUR TELEPHONE SYSTEM Dialing a Call to a Remote Office (NBX 100 and SuperStack 3 NBX) On these systems, you can dial calls between sites that are separated geographically but that are linked by a Wide Area Network (WAN) connection. Typical configurations are described in the next sections. Using Unique Extensions In the sample network shown in Figure 6, each site must have unique telephone extensions. Whenever you make a call to an extension not located at your own site, your NBX system sets up a connection to the appropriate site. In this example, to call a user in Dallas, a user in Chicago dials a Dallas extension (3000 through 3999). The dial plan on the Chicago NBX system sets up the necessary connection to the Dallas NBX system and then to the extension at that site. Figure 6 Using Unique Extensions to Dial Remote Offices Chicago NBX System Extensions 1000-1999 WAN Atlanta NBX System Extensions 2000-2999 Dallas NBX System Extensions 3000-3999 Using Site Codes Your administrator also can configure your telephone system to use site codes for dialing remote offices. Each site may have overlapping telephone extensions. In this example, you dial a site code first, followed by the extension at the site. Your administrator chooses the site codes for your system. For example, as shown in Figure 7, to call someone in Atlanta, a user in Chicago dials the site code 62 and then the appropriate extension (1000 through 3999). To reach a user in Dallas, a user in Chicago dials 63 and then the appropriate extension (1000 through 3999). The site code prevents conflicts between the remote extension number and a duplicated extension number at the local site (Chicago).