Sony PCS-1 Operating Instructions Manual page 174

Note
When you are called from a remote party and the remote party has set a lower number
of ISDN channels than that in this terminal, the setting on the remote party's terminal
has priority.
To connect with a normal phone
When you are using an ISDN connection, a normal phone can be connected at
up to five points.
Only the 1B (64K) connection is available for a normal phone.
Notes
• When using the ISDN connections, installing the PCS-320M1 H.320 MCU software
into two or more Communication Terminals does not allow cascade connection.
• For a multipoint videoconference only the Communication Terminal in which the
PCS-320M1 H.320 MCU software is installed is used as the main terminal. If you
want to use two or more Communication Terminals as main terminals depending on
the type of conference, the same number of H.320 MCU software as that of the main
terminals is required.
174
Connection Examples for a Multipoint Videoconference