Akuvox E21 Series - Network-Advance; Time;Lang; Call Feature

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4.6. Network-Advance
Local RTP:To display and configure Local RTP settings.
Max RTP Port: Determine the maximum port that RTP
stream can use.
Starting RTP Port: Determine the minimum port that RTP
stream can use.
4.7. Time/Lang
Go to Phone->Time/Lang, to select local Time Zone for NTP server.
4.8. Call Feature
Go to Phone->Call Feature, to configure Phone-Call Feature.
Return Code When Refuse: To configure return sip status code.
Auto Answer Delay: To configure answer delay when receiving a call.