2 LINE voip phone/SIP ip phone/voip sip phone with rj45

1 RJ9 for headset

1 DND switch

Full duplex hands-free speaker phone

Headset jack and Wall-mount

G.711 (A-Law, μ-Law) with PAMS above 4.3

G.729A/AB with PAMS above 4.0

G.723: 5.3kbps and 6.3kbps

G.722

Adaptive Jitter Buffer Management

Voice Activity Detection

Comfort Noise Generation

MAC address cloning

SIP proxy redundancy: dynamic via DNS SRV, A records

Direct IP to IP calling

NAT Traversal: Traversal by STUN

Built-in NAT Router

QoS with Layer 2 and Layer 3

DHCP Server and Client

IP conflict detection

Firmware Upgradeable

Web Management Interface

Password Management

Local and Remote Syslog (RFC3164)

Auto Provisioning: TFTP, HTTP and HTTPS

SNTP Time Synchronization

Multi User Level

SNMPv2

2 lines, Call Waiting, Auto Answer, Music on hold, Caller ID and call waiting ID

3-way Conference, Call Hold, Call Forwarding, Call Mute

Call Transfer: blind transfer and attended transfer

Delayed Hotline, SMS Functions, Redial, Speed Dia, BLF

Pick up, Call park, Dial Plan, Phonebook, Black List, MWI, DND

Call log: redial list, answered calls and missed calls

Full-duplex Speakerphone

Volume Adjustment: Handset/Headset, Speaker and Ringer