• SIP 2.0 (RFC3261) compliant
• G.711, G.723.1 and G.729 voice codec 
• Supports STUN, Outbound Proxy
• Selective PSTN / VoIP voice communications
• PSTN / VoIP incoming call alerting
• Up to 5 Proxy server registrations 
• 3-Way Conference / Caller ID 
• Built-in phone book / Speed dial
• Call Hold / Waiting / Transfer / Forward 
• VAD / CNG / AEC / PLC / AJB /AGC
• Incoming / Outgoing / Miss Call record
• QoS / NAT / DHCP Server 
• Web / Keypad management

MODEL
Model VIP-254NT
Hardware Specification
WAN 1x 10/100Mbps RJ-45 port
LAN 1x 10/100Mbps RJ-45 port
Telephone Interface 1x RJ-11 PSTN connectivity
LCD display 2x 16 characters
Speaker Full duplex hands free speaker phone
Dimensions W x D x H 168x 220 x 60 mm
Power Requirements 7.5V DC, 1A
Protocols and Standard
Standard SIP 2.0 (RFC3261), MD5 for SIP authentication (RFC2069/ RFC 2617, SIP outbound proxy, SIP NAT Traversal Support STUN RFC3489
Protocols SIP 1.0 (RFC2543), SIP 2.0 (RFC3261), TCP/IP, UDP/RTP/RTCP, HTTP, ICMP, ARP, RARP, DNS, DHCP, SNTP, PPPoE
Voice codec G.711: 64k bit/s PCM
G.723.1: 6.3k / 5.3k bit/s
G.726: 16k / 24k / 32k / 40k bit/s ADPCM
G.729: 8k bit/s
Voice Standard Voice activity detection VAD
Comfort noise generation CNG
Acoustic echo canceller AEC
G.165: Line echo canceller LEC
Jitter Buffer
Supplementary services Caller ID
3Way conference
Immediate (unconditional) call forwarding
Busy call forwarding
No answer calls forwarding
Call Hold / Waiting / Transfer
Call history Record incoming call
Outgoing call
Missed (not accepted) call history
Network and Configuration
Access Mode Static IP, PPPoE, DHCP
Management Web, LCD menu keypad, auto-provision by TFTP/FTP/HTTP
Environment
Operating 0-50Degree C, 0~90% humidity

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