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74 CHAPTER 7: GETTING MORE FROM YOUR TELEPHONE SYSTEM
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
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 example, as shown in Figure 7
, to call someone in Atlanta, a user in
Chicago dials the site code 62 and then the extension (1000 through
3999). To reach a user in Dallas, a user in Chicago dials 63 and then the
extension (1000 through 3999). The site code prevents conflicts between
the remote extension and a duplicated extension at the local site.
Figure 7 Using Site Codes to Dial Remote Offices
Chicago
NBX System
Extensions
1000–1999
Atlanta
NBX System
Extensions
2000–2999
Dallas
NBX System
Extensions
3000–3999
WAN
WAN
Chicago
NBX System
Extensions
1000–3999
Atlanta
NBX System
Extensions
1000–3999
Dallas
NBX System
Extensions
1000–3999
Site Code 61
Site Code 63
Site Code 62