4-channel gsm voip gateway,Goip-4 The 4-channel GSM VoIP Gateway/GoIP-4 bridges the GSM and the IP networks by enabling voice communications. It is ideal for VoIP to Local termination where a fixed telephone line (PSTN) is not available or for cellphone roaming via the a VoIP network. Significant savings on long distance charges can be realized. Key Features : - Open Standard VoIP Protocols (ITU H. 323 V4 and IETF SIP V2) -Single or Multiple Server Registrations -Two 10/100 Ethernet circuits connect to the LAN and an additional device -GSM module for making GSM calls -Speech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer VLAN and QoS support -NAT Transversal and Router functions -Voice prompts, HTTP Web, Auto Provision support for configuration and updates -Highly stable embedded Linux operating system in high performance ARM 9 Processor Basic 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 or dial out -Retransmit GSM Caller ID to VoIP terminal Enhanced Features -Dynamic selection of codec -Advanced jitter buffer Automatic traversal of NAT and firewall -VLAN / Qos -Router -Echo cancellation for Speakerphone -Comfort noise generation (CNG) -Voice activity detection (VAD) -Auto provisioning (requires auto provisioning server) -On line firmware upgrade -Multi-language support: English and Chinese 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 Simple Traversal of User Datagram Protocol (UDP) Through Network -AddressTranslators (NATs) -RFC 3891 SIP Replaces Header -RFC 3892 SIP Referred-By Mechanism draft-ietf-sipping-CC-transfer-04 Session Initiation -Protocol Call Control - Transfer -Codec: G. 711 (A Law), G. 729A/B, G. 723.1 -DTMF: RFC 2833, In-band DTMF, SIP INFO Physical and Environmental -Operating temperature: 10 C to 40 C (50 F to 104 F) -Storage temperature: 0 C to 50 C (32 F to 122 F) -Weight: 500 g (1 lb) (Including AC/DC Adapter) -Size: 105 mm (W) x 100 mm (L) x 28 mm (H) (Width x Length x Heigth -Power: 12 Vdc 500 mA (AC/DC adapter included). Siae:36*21*7 Weight:1KG.
