Denwa Communications DW-820, User Manual

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4.7.6 Call Waiting
Open call waiting, if enable call waiting, after establishment of a conversation, there
is a third party call in, then video phone will have a new call tips, you can choose to
answer or reject the call. If you close the call waiting, then the third party cannot call
in, will prompt a busy tone, turned on by default.
Configuration on the phone:
1.Phone Settings->Call Settings->Call Waiting
2.
Enable Call Waiting.
4.7.7 Playtone
The caller will hear the tone when waiting. Different SIP server supports different
playtone.
4.7.8 Intercom
It is used to answer the incoming call automatically after users set up the intercom
function. In default situation, the IP phone DENWA DW-820 will answer the
intercom incoming calling automatically and make a noise. You can set the phone
to enable silent mode when picking up the intercom call so that the other will not
hear you.
4.7.9 Hotline
The Hot line refers to the number you often dial. You can set hot lines in the phone,