Appendix D
VIP-281GS Specifications
Product
H.323/SIP VoIP GSM Gateway
Model VIP-281GS
Hardware
WAN
1 x 10/100Mbps RJ-45 port
FXS
1 x RJ-11 connection
PSTN
1 x RJ-11 connection
GSM
1 x SIM connection
Protocols and Standard
Standard
H.323 v2/v3/v4 and SIP (RFC 3261)
SDP (RFC 2327)
Symmetric RTP
STUN (RFC3489)
ENUM (RFC 2916)
RTP Payload for DTMF Digits (RFC2833)
Outbound Proxy Support.
Voice Codec
G.711(A-law /
μ
-law), G.729 AB, G.723 (6.3 Kbps / 5.3Kbps)
Voice Standard
Voice activity detection (VAD)
Comfort noise generation (CNG)
G.165/G.168 Echo cancellation
Dynamic Jitter Buffer
Protocols
SIP 2.0 (RFC-3261), H.323, TCP/IP, UDP/RTP/RTCP, HTTP, ICMP,
ARP, PPPoE, DNS
Advanced Function
Smart QoS, IP TOS (IP Precedence) / DiffServ
Network and Configuration
Access Mode
Static IP, PPPoE, DHCP
Management Web,
Telnet
LED Indications
System: 1, PWR
WAN: 1, LNK/ACT
Line: 1, In-Use/Ringing
Phone: 1, In-Use/Ringing
GSM: 1, In-Use/Standby
SMS: 1, Transmission
Dimension (W x D x H)
180 x 110 x 25 mm
Operating Environment
0~40 degree C, 0~90% humidity
Power Requirement
12V DC
EMC/EMI
CE, FCC Class B