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

yx gsm gateway

Supported Standards

ITU: H.**3 V4, H.**5, H.**5, H.**5, H.**0

RFC ***9 - RTP/RTCP

RFC ***7 -SDP

RFC ***3 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals

RFC ***6 - SIP INFO Method

RFC ***1 - SIP

RFC ***4 - Offer/Answer model with SDP

RFC ***5 - SIP REFER Method

RFC ***2 - A Message Summary and Message Waiting Indicator

RFC ***9 - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)

RFC ***1 - SIP "Replaces" Header

RFC ***2 - SIP Referred-By Mechanism

draft-ietf-sipping-cc-transfer**4 - Session Initiation Protocol Call Control  Transfer

Codec: G.**1 (A/µ law), G.**9A/B, G.**3.1

DTMF: RFC ***3, In-band DTMF, SIP INFO

Operating temperature: *0°C to *0°C (*0°F to **4°F)

Physical and Environmental

Storage temperature: 0°C to *0°C (*2°F to **2°F)

Power: *2 VDC 2A (**0V***0V) (AC/DC adapter included)

Warranty: one year