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Appendix C VIP-254T / VIP-254PT Specifications
Product SIP IP Phone SIP PoE IP Phone
Model VIP-254T VIP-254PT
Hardware
LAN 1 x 10/100Mbps RJ-45 port
Power Over Ethernet 802.3af compliant at VIP-254PT
PC 1 x 10/100Mbps RJ-45 port
LCD display 2 x 16 characters
Speaker Full duplex hands free speaker phone
Protocols and Standard
Standard SIP 2.0 (RFC3261), MD5 for SIP authentication (RFC2069/ RFC 2617), SIP
outbound proxy, SIP NAT Traversal Support STUN (RFC3489)
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.729A: 8k bit/s (CS-ACELP)
G.729B: adds VAD & CNG to G.729
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
3-way conference
Immediate (unconditional) call forwarding
Busy call forwarding
No answer calls forwarding
Call Hold/Waiting/Transferring
Call history Record incoming call
Outgoing call
Missed (not accepted) call history
Protocols SIP v1 (RFC2543), v2(RFC3261), TCP/IP, UDP/RTP/RTCP, HTTP, ICMP, ARP,
RARP, DNS, DHCP, SNTP, PPPoE
Network and Configuration
Access Mode Static IP, PPPoE, DHCP
Management Web, LCD menu keypad, auto-provision by TFTP/FTP/HTTP
Dimension (W x D x H) 184 mm x 200 mm x 48 mm
Operating Environment 0~50 degree C, 0~90% humidity
Power Requirement 5V DC, 1A
Power Over Ethernet 802.3af compliant at VIP-254PT
EMC/EMI CE, FCC Class B