Additions: - TGP500 supported VLAN. - Supported a incoming REFER in transfer call function. - Changed the specification not to display "Missed Call" when any other terminal answers to the imcoming call of the shared line. - Supported handling for the transfer by INVITE with Replaces Header. - Changed a call when "hold" is pressed in both sides at the same time to retry and not to disconnect. - Supported the voicemail function although it is not notified the information of the number of Voicemail Message from the server. [VOICE_MESSAGE_AVAILABLE] (Y: Determines that voice messages exist when"Messages-Waiting: yes" is received with a "Voice-Message" line included) (N: Determines that voice messages exist when"Messages-Waiting: yes" is received even without a "Voice-Message" line included.) - Supported the Pre Provisioning by HTTPS, HTTP, TFTP. - Changed the specification of transfer function. If the destination of call transfer answers by voice-mail, back to the original call easily. - Supported MoH (Music on Hold) of server when connected to particular server. [HOLD_SOUND_PATH_n] (0: The unit's hold tone is played. 1: MoH is played.) - Supported for Client Certificate
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