Panasonic KX-TGM420 Operating Instructions Manual page 77

Call share
You can join an existing outside call.
Handset
To join the conversation, press [TALK] when the other
unit is on an outside call.
Base unit
To join the conversation, press [
handset is on an outside call.
Note for handset and base unit:
• A maximum of 3 parties (including 1 outside party)
can join a conversation using 2 extensions.
(3-way conference)
• To prevent other users from joining your
conversations with outside callers, turn call sharing
mode off (page 117).
Transferring calls, conference calls
Outside calls can be transferred or a conference call *1
with an outside party can be made:
– between 2 handsets
– between a handset and the base unit
] when the
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