Panasonic KX-TG2700S 用户手册

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页码 84
Call Share
This feature allows the handset or the base unit to join the existing
external call. 
When the system has one or more additional handsets (p. 21), a handset
user can join another handset user’s conversation.
To join a conversation (Call Share)
Handset:
Press or .
Base unit:
Press 
(DIGITAL!SP-PHONE)
.
•A maximum of five parties including the outside party can join a conversation.
Ex. While the base unit is engaged in an external call, up to 3 handsets can join
the conversation.