12 CONVENTIONAL IP NETWORK / 12.7 SIP Phone170FUNC (E)/ Ver 2.00Configuration DescriptionEnable TLS Enable TLS is the function to switch the session between a SIP Phone Server and therepeater to TLS.TLS is a mechanism which can use communications between various server clients usingTCP/ IP as secure communication paths. By enabling Enable TLS, the repeater canencrypt the SIP session to a SIP Phone Server. This allows information such as theunique ID used for connection to the SIP Phone Server to be concealed.EnableTLS is enabled and the SIP session is encrypted.DisableTLS is disabled and the SIP session is normal with the SIP session not encrypted.Expires [s] Expires is a registration validity period of SIP User ID for the SIP Phone Server by therepeater.Before the validity period expires, Registration to a SIP Phone Server is performed by therepeater.MaximumConversation Time [s]Maximum Conversation Time is the maximum length of time to maintain the call if a PhoneCall is established between the repeater and SIP server. This timer is used to prevent aPhone Call from being held for overly long.Also, if no disconnect request from the transceiver or SIP Phone exists, or if a disconnectrequest cannot be received for any reason, the call is disconnected when the timerexpires.A system administrator can structure a system that suits the operation environment of thesystem by configuring this timer. For example, shortening the time of each communicationfor the system where congestion frequently occurs allows more users to communicate.UnlimitedThe disconnection of a call is not performed when the length of time elapses.120 sec to 600 secDuring Phone Call communication, the communication of a Phone Call is disconnectedwhen the length of time configured in Maximum Conversation Time elapses and PTT forthe transceiver or Console is released.When the length of time configured in Maximum Conversation Time elapses and thetransceiver or Console is transmitting audio, the communication of a Phone Call isdisconnected after PTT is released.Reply Timeout onOutgoing Call [s]If no response is received for a certain length of time from the transceiver or Console aftera Phone Call is established between the repeater and SIP server, the call is disconnectedwhen the timer expires.