- 4 -4.3.4. Phone ................................................................................................................................... 404.3.5. Maintenance........................................................................................................................ 474.3.6. Security ............................................................................................................................... 524.3.7. Logout ................................................................................................................................. 584.4. Configuration via Keypad .......................................................................................... 594.4.1. Keypad introduction .......................................................................................................... 594.4.2. Menu Tree ........................................................................................................................... 595. Appendix .................................................................................................................. 615.1. Specification ................................................................................................................ 615.1.1. Hardware ............................................................................................................................ 615.1.2. Voice features ..................................................................................................................... 615.1.3. Network features ................................................................................................................ 625.1.4. Maintenance and management ......................................................................................... 625.1.5. Special features ................................................................................................................... 625.2. Digit-character map table .......................................................................................... 62