Cheap and best Unlocked phone with FXS and PSTN VoIP Gateway

Key Features

• Static IP support
• Switch mold support
• support DHCP,PPPOE
• Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP V2)
• Two 10/100 Ethernet for WAN / LAN connections
• Peer-to-Peer IP Calls
• Speech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer
• Line Echo Cancellation
• 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

• Four RJ-11 FXS port for traditional phone set or PBX's trunk line
• LEDs for Power, Ready, Status, WAN, PC, FXS
• Call Forward, Call Hold, Call Transfer
• Dial Plan
• Caller ID
• 3 times re-password
• Billing support
• Keyboard setting
• IP voice enrollment

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 Address Translators (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/µ law), G.729A/B, G.723.1
• DTMF: RFC 2833, In-band DTMF, SIP INFO

Hardware Specifications

• Processor: ARM9E 133MHz
• DSP: VPDSP101 196MHz
• Memory: RAM 16MB/ Flash 4MB
• Power: Input AC100V ~ 240V, output 24VDC / 500mA
• Power consumption: 4W maximum
• Network card: 100/10Base-T x2
• LED: Operation and lines light
• RJ11:four 24V feed 48V ring
• 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: 540 g (1 lb) (Including AC/DC Adapter)
• Warranty: one year