device after hooking off and before Call ring duration, the two-way audio will be started just like normalconversation on a phone.*1 If the SIP device on the callee side is Audio only, two-way audio will be automatically started.Ringback tone after finish video monitor:Once YES is selected for this item, if the caller hook on the phone during video monitoring, the SIP outgoingwill be stopped. The caller still can only hear ringback tone, and the user is not aware that the SIP outgoinghas stopped.Indication of call status when receiving call:Once "Yes" is selected for this item, the caller can see the LED status and hear confirmation tone to know thatthe conversation has started or ended.2.7.2 SIP SettingsSIP SettingsUser can set the PBX server IP address, and related authentication information in this page, to register to PBX.• Phone Number: Specifies the phone number to use as the user ID required for registration to the SIPregistrar server.• Registrar Server Address: Specifies the IP address or FQDN of the SIP registrar server.64 User’s Manual2 Software