4.2.1. Call Time Related ........................................................................................................................................................ 38
4.2.2. SIP Call Related .......................................................................................................................................................... 38
4.2.3. Codec .......................................................................................................................................................................... 39
4.2.4. DTMF ........................................................................................................................................................................... 41
4.2.5. Encryption .................................................................................................................................................................... 42
4.2.6. NAT ................................................................................................................................................................................................... 42
4.2.7. User Agent ................................................................................................................................................................... 42
4.3. Access Control ...................................................................................................................................................................... 43
4.3.1. Web Relay ................................................................................................................................................................... 43
4.4. Security ................................................................................................................................................................................. 44
4.4.1. Motion .......................................................................................................................................................................... 44
4.4.2. Action ........................................................................................................................................................................... 45
4.5. Upgrade ................................................................................................................................................................................ 48
4.5.1. Web Upgrade............................................................................................................................................................... 48
4.5.2. Autop Upgrade ............................................................................................................................................................. 48
4.5.3. Backup Config File ....................................................................................................................................................... 49