Well SIP-T28P, Руководство пользователя

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Enterprise IP Phone Overview
8
DTMF Keypad
Use the DTMF hard keys to enter numbers, letters and special characters. Depending
on the selected input mode, you can enter digits, lower / upper case or special
characters.
Navigation Keys
Use the navigation keys to navigate in the display menus and confirm or cancel
actions.
Audio Device Control Keys
Use the audio device control keys to perform the following actions depending on your
phone type:
：
Adjust the volume of the handset, headset, speaker, ring tone and
signal tone;
：
Allow hands-free communication during calls;
Press it again to switch to the Group Listening mode;
：
Place and receive calls through an optionally connected headset. The LED
will be on when the phone is in Headset mode;
：
Mute audio transmission locally during calls;
Hard Feature Keys
：
Allow users to access the voicemail interface directly;
：
Enable a setup of Conference;
：
Place a call on hold or resume it;
：
During a call, press it to transfer the current call to the third party;
When the phone in the idle status, press it to enter the forward configuration
page;