48 Basic functionsBasic functionsSecure voice communicationPrerequisite: The secure voice communication option must be activated by ad-ministrator.If you call a party or receive a call from a party over a secure connection, a pad-lock icon1 appears on the other party's row on your graphic display. You can optto have voice connections that are no longer secure indicated by a brief alertingtone and a window with the message "Unencrypted call" (see Page 224).Emergency modeIf a failover system has been set up for your OpenScape Voice, you can stillmake calls and use the functions of the failover system, for example, despitenetwork faults.If it happens that your telephone is no longer connected to OpenScape Voice, itis registered automatically on the configured failover system. The message"Limited service B8" then appears on the display.Some functions may not be accessible while in emergency mode, for example:• Call forwarding ( Page 77)• Voicemail ( Page 58)• Callback ( Page 75)• Group functions ( Page 55)• Multiline ( Page 124)• OpenScape Voice functions ( Page 184)Please read the introductory chapters "Getting to know yourOpenScape Desk Phone IP55G" Page 15 and "Applications availableon your OpenScape Desk Phone IP55G" Page 33 carefully before per-forming any of the steps described here on your phone.1. Normal for secure or struck-through for unsecured voice communication
