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If phone to true, the phone may auto answer to incoming call if requested by SIPUA
layer.
Menu->Feature->Intercom->Account
Features ->Intercom-> Enable Intercom
when the phone auto answer an intercom call , it will mute or not
Features ->Intercom-> Intercom Mute
when the phone auto answer an intercom call , it will have beep voice or not
Features ->Intercom-> Intercom Tone
when the phone alreadt auto answer an intercom call ,for the second intercom
incoming call, it will have auto answer it or not.