Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones648If you place a call via web user interface but the trusted IP address has not been configured, theweb user interface prompts “Call fail”.To place a call via web user interface:1. Click on Directory->Phone Call Info.2. Select the desired account from the pull-down list of Outgoing Identity.3. Enter the callee’s number in the Dial Number field.4. Click Dial to dial out the number.The web user interface prompts “Call Success” and the phone will automatically dial outthe number. You can click Hang Up to end the call.If it is the first time you place a call via web user interface, the LCD screen will prompt themessage “Allow remote control?”. Press OK on the phone to allow remote control and thenthe phone will automatically dial out the number.NoteServer RedundancyServer redundancy is often required in VoIP deployments to ensure continuity of phone service,for events where the server needs to be taken offline for maintenance, the server fails, or theconnection between the IP phone and the server fails.Two types of redundancy are possible. In some cases, a combination of the two may bedeployed: Failover: In this mode, the full phone system functionality is preserved by having a secondequivalent capability call server take over from the one that has gone down/off-line. Thismode of operation should be done using the DNS mechanism from the primary to thesecondary server. Fallback: In this mode, a second less featured call server with SIP capability takes over callcontrol to provide basic calling capability, but without some advanced features (forexample, shared line, call recording and MWI) offered by the working server. IP phonessupport configuration of two servers per SIP registration for fallback purpose.You can also place an IP direct call via web user interface. The IP phone supports either IPv4 orIPv6 address.
