3Com NBX 100 Administrator's Manual page 88

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On a SuperStack 3 NBX system, you can have up to twelve 4-person
conference calls simultaneously.
On a SuperStack 3 NBX system, 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 be able to make conference calls between sites, you must have IGMP
(Internet Group Management Protocol) implemented on your network.
Conference Calls Using Site-Unique Extensions
In Figure 10, 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 11, 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.
4 Press Conference again and dial the Dallas site code (63) and then the
extension of the user in Dallas.
5 When the Dallas user answers, press Conference again to connect all
four users.