GOIP8 (8 SIM Cards VoIP GSM Gateway)
GOIP8 is a tpye of 8 channels VoIP GSM Gateways for call termination (VoIP to GSM) and origination (GSM to VoIP). It is SIP& H. 323 based and compatible with Asterisk. It can enable to make 8 calls simultaneously from IP phones to GSM networks and GSM network to IP phone.
The 8 SIMs GSM Gateway (GoIP) bridges the GSM services and the IP networks. Each GSM channel can be programmed individually to establish the connectivity with IP-PBX, or can be bundled as a single trunk in connection with IP-PBX. The GoIP8 brings mobility, scalability and significant savings on long distance charges.

VOIP GSM Gateways Key Features
Provide eight cellular channels for IP-PBX
Support open standard SIP Protocols (IETF SIP V2)
Support SIP proxy mode
Multiple GoIP8 grouping mode
Two 10/100 Ethernet ports for the LAN and an additional device
Quad band GSM module: support GSM 850MHz, 900 MHz, 1800 MHz, 1900MHz
Speech quality ensured by QoS at LAN, IP layers and comprehensive jitter buffer
VLAN and QoS support
NAT Transversal
Voice prompts, HTTP web
Highly stable embedded Linux operating system in high performance ARM 9 Processor

VOIP GSM Gateways Enhanced Features
LEDs for Power, Ready, Status, WAN, PC, GSM
Call forward from GSM to VoIP and VoIP to GSM
Dial in mode or dial out mode only
Dial Plan
Password protection for both GSM dial in and dial out
Retransmit GSM Caller ID to VoIP terminal
Dynamic selection of codec
Advanced jitter buffer
Automatic traversal of NAT and firewall
VLAN/Qos
Echo cancellation for Speakerphone
Comfort Noise Generation (CNG)
Voice Activity Detection (VAD)
Auto provisioning (requires auto provisioning server)
Firmware upgrade from GUI

VOIP GSM Gateways Supported Standards
ITU: H. 323 V4, H. 225, H. 235, H. 245, H. 450
RFC 1889 - RTP/RTCP
RFC 2327 - SDP
RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
RFC 2976 - SIP INFO Method
RFC 3261 - SIP
RFC 3264 - Offer/Answer model with SDP
RFC 3515 - SIP REFER Method
RFC 3842 - A Message Summary and Message Waiting Indicator
RFC 3489 (STUN) - Simple traversal of User Datagram Protocol (UDP) through Network Address Translators (NATs)
RFC 3892 - SIP Referred-By Mechanism
Proprietary Firewall-Pass-Through Technology
Codec: G. 711 (A/? Law), G. 729A/B, G. 723.1
DTMF: RFC 2833, In-band DTMF, SIP INFO
Web-base Management
PPP over Ethernet (PPPoE)
PPP Authentication Protocol (PAP)
Internet Control Message Protocol (ICMP)
TFTP Client
Hyper Text Transfer Protocol (HTTP)
Dynamic Host Configuration Protocol (DHCP)
Domain Name System (DNS)
User account authentication using MD5

VOIP GSM Gateways Hardware Specifications
Processor: ARM9E 133MHz
DSP: VPDSP101-4 100MHz
Memory: RAM 16MB/ Flash 4MB
GSM Module: Type: 850MHz, 900MHz, 1800MHz, 1900MHz
Power: Input AC100V~240V, output 12 Vdc 2000 mA
Power consumption: 5W maximum
Operating temperature: 10° C to 40° C (32° F to 104° F)
Storage temperature: 0° C to 50° C (32° F to 122° F)
Working Humidity: 40%~90% not congealed
Weight: 1550g (3 lb) (including AC/DC Adapter)
Warranty: 1 year