Additional features102Use the following procedure to configure call blocking:1. In idle mode, press MENU.2. Select Settings.3. Press OK.4. Select Phone settings.5. Press OK.6. Select Call barring.7. Press OK.8. Enter your PIN.9. Press OK.10. Select Prefix.11. Press OK.12. Select the Prefix slot to configure.13. Press OK.14. Press BACK.15. To restrict voice calls, select Voice call.ORTo restrict video calls, select Video call.Using voice mailIf you subscribe to a voice mail service, access your voice mail using theIP Phone 1535.To configure your voice mailbox number, contact your systemadministrator.1. In idle mode, press MENU.2. Select Services.3. Press OK.4. Select Voicemail.