I/O Interface
1 RJ-45 for Internet port (Ethernet 10/100 Base-T)

1. 1 RJ-45 for PC port (Ethernet 10/100 Base-T)
2. 1 EXT port
3. 1 headset port

1 DND switch

1. G.729A/AB with PAMS above 4.0
2. G.723: 5.3kbps and 6.3 kbps
3. G.722 (high quality)
4. Adaptive Jitter Buffer Management
5. Voice Activity Detection
6. Comfort Noise Generation

Echo Cancellation

1. MAC: Address Cloning
2. VPN: PPTP and T2TP
3. DMZ
4. Layer 2 QoS: 802.1Q/VLAN ID and 802.1p PRI
5. Layer 3 QoS: SIP QoS, RTP QoS and Data QoS
6. SIP proxy redundancy: dynamic via DNS SRV, A records
7. Direct IP to IP calling
8. NAT Traversal: Static NAT Route and Traversal by STUN
9. Built-in NAT Router
10. DHCP Server and Client
11. IP conflict detection

Support PoE comply with IEEE802.3af(optional)

1. SNTP Time Synchronization
2. Daylight Saving Time
3. Alarm Clock
4. Password Reset
5. Web access management
6. Local and Remote Syslog (RFC3164)
7. Factory Default
8. Firmware Upgradeable
9. Web Management Interface
10. Auto Provisioning: TFTP, HTTP and HTTPS
11. Multi User Level
12. SNMPv2

TR069

1. 3-way Conference, Call Hold, Call Forwarding, Call Mute,
2. Call Transfer: blind transfer and attended transfer
3. Delayed Hotline, Redial, Speed Dial, BLF, Pick up, Call park, Dial Plan
4. Phonebook, Black List, MWI, DND, Full-duplex Speakerphone
5. Call log: redial list, answered calls and missed calls
6. Volume Adjustment: Handset/Headset, Speaker and Ringer

DTMF Relay: In-band, Out-band(RFC2833) and SIP INFO