Using ISDN Supplementary Services 6-2
Chapter 6: PBX, CENTREX, & ISDN FEATURES
MBX IP Station User Guide
Using ISDN Supplementary Services
ISDN service providers may incorporate features similar to those of Centrex. These ISDN
Supplementary services are provided on a subscription basis, and as with Centrex, are
accessed using the Flash button on an C phone.
Using supplementary services an ISDN line can be placed on Hold and a second call placed on
the line. You may then alternate between the two held calls (Broker Call) using the hold button.
An ISDN line conference can be established using the Flash and Conf Soft buttons. A
conference can also be placed on hold.
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