Voip Phone By Hanlong Technology Co., Ltd.

voip phone Unicorn 4102
2 sip accounts with phone book
4 lines X 16 characters big LCD
Phone Functions:
Message Wait Indicator
SIP Registration (2 BLF keys)
Two Ethernet ports (10/100)
Call History
Phone Book (XML100 Entries)
Full Duplex Speakerphone

Call Features:
Call Redial
Call Block (DND)
Call Hold
Call Transfer
Call Forward
Call Waiting
Three parties Conference

Tones:
Ring tone,Ring back tone,Dial tone,Busy tone

DTMF Function:
In-Band, In-Audio, RFC2833

Voice Quality
Silence Suppression
VAD: Voice activity detection CNG: Comfortable noise generator
AEC: Acoustic echo canceler G.168: Network echo canceler Jitter Buffer

Codec:
G.723.1
G.726
G.729A G.729B
G.711 (a-law/u-law)

Nat Traversal:
STUN
Media Relay
Automatic NAT Traversal

QOS:
802.1Q VLAN, 802.1P TOS, DiffServ

IP Assignment:
PPPoE, DHCP, Static IP

Network Protocol:
SIP Version 2 (RFC3261) TCP/UDP/IP RTP/RTCP ICMP,
ARP/RARP DNS, DHCP, NTP, PPPoE STUN, UPNP

Phone Buttons/Keys:
Five navigation/menu/volume keys,
13 dedicated function keys for: Hold, Speakerphone,Send/Redial,Mute,Transfer,Conference and Message (withmessage indicator), Line 1, Line 2,DND, Play, Phone Book, Answer.

Security:
HTTP Basic/Digest authentication
MD5 for SIP Authentication (RFC 2069/RFC2617)