User Guide
4. Advanced Features ...................................................................................................................................................................... 22
4.1. Phone Configuration ............................................................................................................................................................. 22
4.1.1. LED .............................................................................................................................................................................. 22
4.1.2. IR LED ......................................................................................................................................................................... 23
4.2. Intercom ................................................................................................................................................................................ 24
4.2.1. Call Time Related ........................................................................................................................................................ 24
4.2.2. Return Code When Refuse .......................................................................................................................................... 24
4.2.3. Sip Call Related ........................................................................................................................................................... 24
4.2.4. Codec .......................................................................................................................................................................... 25
4.2.5. Session Timer .............................................................................................................................................................. 27
4.2.6. Encryption .................................................................................................................................................................... 27
4.2.7. NAT .............................................................................................................................................................................. 27
4.2.8. User Agent ................................................................................................................................................................... 28
4.3. Access Control ...................................................................................................................................................................... 29
4.3.1. Web Relay ................................................................................................................................................................... 29
4.4. Security ................................................................................................................................................................................. 30
4.4.1. Anti-alarm ..................................................................................................................................................................... 30