3Com 3C10401A User Guide - Page 100
Dialing a Call to a Remote Office, Using Unique Extensions, Using Site Codes, Using Unique, Extensions
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100 CHAPTER 7: GETTING MORE FROM YOUR TELEPHONE SYSTEM Dialing a Call to a Remote Office You can dial calls between sites in your organization that are separated geographically but that are linked by a Wide Area Network (WAN) connection. Each site must have an NBX system. Typical configurations are described in the next sections. Using Unique Extensions In the sample network shown in Figure 6, everyone in the entire organization has a unique telephone extension. Whenever you make a call to an extension that is not located at your own site, your NBX system sets up a connection to the NBX system at the other extension's 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 1 2 3 4 1 NBX System in Chicago Extensions: 1000-1999 2 Wide Area Network (WAN) 3 NBX System in Atlanta Extensions: 2000-2999 4 NBX System in Dallas Extensions: 3000-3999 Using Site Codes If some users have overlapping telephone extensions, your administrator can configure your telephone system to use site codes for you to dial people at remote offices. Your administrator chooses the site codes for
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