Key Features
1. Open Standard VoIP Protocols (IETF SIP V2)
2. Two 10/100 Ethernet for WAN / LAN connections
3. Supply dynamic DNS service
Basic Features
1. Two RJ-11 FXS port for traditional phone set or PBX's trunk line
2. Support three PTT port
3. LEDs for Power, Ready, Status, WAN, PC, FXS
4. Call Forward, Call Hold, Call Transfer
5. Dial Plan
6. Caller ID
Enhanced Features
1. Dynamic selection of codec
2. Advanced jitter buffer
3. Automatic traversal of NAT and firewall
4. VLAN / Qos
5. Router
6. Echo cancellation for Speakerphone
7. Comfort noise generation (CNG)
8. Voice activity detection (VAD)
9. Auto provisioning (requires auto provisioning server)
10. On line firmware upgrade
11. Multi-language support: English and Chinese
Supported Standards
1. ITU: H.323 V4, H.225, H.235, H.245, H.450
2. RFC 1889 - RTP/RTCP
3. RFC 2327 - SDP
4. RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
5. RFC 2976 - SIP INFO Method
6. RFC 3261 - SIP
7. RFC 3264 - Offer/Answer model with SDP
8. RFC 3515 - SIP REFER Method
9. RFC 3842 - A Message Summary and Message Waiting Indicator
10. RFC 3489 - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)
11. RFC 3891 - SIP (Replaces) Header
12. RFC 3892 - SIP Referred-By Mechanism
13. draft-ietf-sipping-cc-transfer-04 - Session Initiation Protocol Call Control - Transfer
14. Codec: G.711 (A/µ law), G.729A/B, G.723.1
15. DTMF: RFC 2833, In-band DTMF, SIP INFO

Specifications
RoIP (Radio over IP) Intercom system
1. SupportVLAN &QoS
2. Cross network has 3 PTT interfaces
3. Rdiao, VoIP, GSM Public Annouom
RoIP-302M Cross-Network RoIP Gateway/Portable Radio/Intercom System(Radio over IP)
4. Speech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter buffer
5. Line Echo Cancellation
6. VLAN and QoS support
7. NAT Transversal and Router functions
8. Support IP voice stream to via a recording server
9. Highly stable embedded Linux operating system in high performance ARM 9 Processor
Which group can benefit from RoIP?
Adio Service Operators who would like to expands their geographical coverage.
Radio User who would like to make and receive calls from the telephone networks.
System administrators who would like to monitor and maintain good control over the existing radio networks.
System Integrator who would like to build or deploy a reliable voice communication network in timely manner
RoIP302 series
RoIP302 series is developed based on VoIP technology to realize RoIP functions in order to create a new type of gateway to bridge voice communications across multiple networks (Radio, Cellular, VoIP). Its main advantages are low bandwidth usage, high fault tolerant, low loss in voice quality, fast response, easy installation and configuration. It is ideal for setting up a private network with multiple voice communication platforms, a distributed network for remote management, a network with extended coverage, and an integrated network of multiple amateur radio networks. RoIP302 Series Cross-Network Gateway has 3 PTT interfaces. Up to 3 audio channels from radio networks can be connected to the RoIP302 simultaneously. All 3 channels can be programmed into the same or different groups in order to bridge real time voice communications to various network interfaces. RoIP302 Series has a built-in GSM / CDMA cellular phone module, user can access the radio networks connected via the cellular network installed. A radio terminal equipped with DTMF generation capability can make an outgoing call via the cellular network as well. This links up the two networks which cannot be linked up via any traditional means. RoIP302 Series gateway can also be a remote ON/OFF Switch. User can control the built-in relay to switch on or off the devices that are under control. These devices could be an alarm signal, a light, a public announce system, an electronic lock, etc. RoIP302 Series gateway supports routing of IP voice stream to via a recording server. Voice records can then be saved to a hard disk and can be retrieved at any time for examinations.