Sony SPP-IM977 - Manual (Page 51)

Telephone Features
51 US
Telephone Features
Switching conference from the handset to
the base phone
1
Press (HOLD) on the handset to put both lines on hold.
The LINE 1 and LINE 2 buttons on the handset and the base
phone flash.
2
Press (CONF) on the base phone to resume the conversation.
Switching conference from the base phone
to the handset
1
Press (HOLD) on the base phone to put both lines on hold.
The LINE 1 and LINE 2 buttons on the base phone and the
handset flash.
2
Press (CONF) on the handset to resume the conversation.
To join on the base phone while the handset
is talking on one line
Press the double flashing (LINE 1) or (LINE 2) on the base
phone. Now you can talk to the handset and to the line
connected.
To join on the handset while the base phone
is talking on one line
Press the double flashing (LINE 1) or (LINE 2) on the handset.
Now you can talk to the base phone and to the line connected.
To join three-way conference (four-way
conference)
Press (LINE 1) or (LINE 2).