3Com 3C10402B, Руководство администратора

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332 C
HAPTER
12: V
IRTUAL
C
ONNECTIONS
site code, there is no conflict between the extension dialed and an
identical extension number at the local site (Chicago). The choice of site
codes is made by the person who configures the dial plans for the sites.
See “Dial Plan Configuration” on page 334 for more information about
how to set up VTLs in the dial plan.
Conference Calls
Using VTL
Connections
Users can set up conference calls over VTLs in much the same way that
they set up conference calls with other users at their local site, or at a site
reachable by an external telephone line.
■
On V3000, V3001R, or V5000 systems, you can have up to twelve
4-person conference calls simultaneously.
■
On NBX 100 systems, you can have up to four 4-person conference
calls simultaneously.
To make conference calls between sites, you must implement IGMP
(Internet Group Management Protocol) on your network.
Conference Calls Using Site-Unique Extensions
In Figure 20 , a user in Chicago establishes a conference call with two
users in Atlanta and one user in Dallas as follows:
1 Dial the first extension in Atlanta.
2 After the user answers, press Conference and dial the second extension
in Atlanta.
3 When the second user answers, press Conference again to connect all
three users.
4 Press Conference again and dial the extension of the user in Dallas.
5 When the fourth party answers, press Conference to connect all four
users.
Conference Calls Using Site Codes
In Figure 21 , if you work in the Chicago office, to establish a conference
call with two people in Atlanta and one person in Dallas:
1 Dial the site code (62) and the first extension.
2 After the first user answers, press Conference , dial the same site code
(62) and the second extension in Atlanta.
3 When the second Atlanta user answers, press Conference again to
connect all three users.