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61200.153L1-13 Express XR/XRT Quick Start Guide 13
Chapter 2. Installation
Conference Calling
Conference Calling (also known as three-way calling) permits a
conversation between three parties, each at different locations.
During a voice call, the call waiting tone signals a second incom-
ing call. Flash-hook to place the first call on hold and answer the
incoming call. Flash-hook again to retrieve the first caller. A
third flash-hook conferences all three parties.
Automatic Redial
Automatic redial dials the last number dialed. This can be
accomplished using a touch-tone phone as follows:
Redial last number: Press ** 5
When connecting to a National ISDN 1 switch, call conferencing and
call transferring are assigned a unique feature identifier number. This
number may not be the same in all areas. S-registers 90 and 91 contain
the feature identifier numbers for conference and transfer. If these
features do not work, contact your ISDN provider.
Phone Number Allocation
The Express XRT allocates ISDN phone number 1 to POTS port
1. Connect the primary telephone to POTS port 1 as shown in
Figure 2-2.
ISDN phone number 2 is shared by the RS-232 port and POTS
port 2, therefore only one can be used at a time.
ISDN data calls and external modem applications must be placed to
ISDN phone number 2.
Single Phone Number Operation
For AT&T 5ESS point-to-point lines and other lines with a single
phone number, incoming voice calls are routed to POTS port 2 to
allow for use of either a modem or a telephone. Service on POTS
port 1 is not available.