The Ethernet Gateway is a next generation VoIP Gateway that provides a cost-saving solution for small business/home users on their telecommunication needs. The MIC-420ATA is following the open standard RFC-3261 SIP protocol to make sure that the user can easily install this device on most of the existing VoIP (Voice over IP) services. By using the state-of-the-art DSP (Digital Signal Processing) technology, the MIC-420ATA delivers outstanding voice quality that is very comparable to the PSTN voice quality.

With the built in LCD display, the user can easily configure the MIC-420 ATA for first time installation in a few minutes. And besides the advanced VoIP functions in easy installation, MIC-420ATA also provides flexible call out function between PSTN call and VoIP call through Ethernet or modem connection. MIC-420ATA is your best VoIP solution in the new generation communication.


  • Choose between PSTN call and VoIP call :
    • The telephone set connected to MIC-420ATA can make either PSTN call or VoIP call easily.
    • When the MIC-420ATA is powered off, the connected telephone set can make PSTN call directly.
  • Following RFC-3261 SIP standard :
    • Support password authentication using MD5 digest and RFC-2833 for DTMF relay.
  • Dynamic IP support( DHCP and PPPoE) :
    • Getting Ip from DHCP server using DHCP protocol or through ADSL modem using PPPoE protocol, automatically reconnect when PPPoE lost connection.
  • Passing through NAT devices:
    • Support outbound-proxy configuration to make outgoing and incoming calls under any NAT devices (even under two layer NAT devices).
  • Remote software upgrade capability (via ftp):
    • FTP protocol provides reliable remote upgrade through Internet.
  • Advanced Digital Signal Processing (DSP) technology to ensure superior audio quality:
    • Hardware System on a Chip solution with built in DSP processor makes sure the perfect voice quality.
  • Support G.723.1 (6.3k/5.3k), G.729A/B, G.711(A-law/U-law) voice codecs :
    • Following ITU-T standard to support best compatibility.
  • Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise Generation) :
    • Silence suppression can save about half of the network bandwidth needed during normal VoIP conversation.
  • Ping function supported:
    • Ping other device in the Internet from MIC-420ATA to make sure the Internet connection is ok.
  • System status display on the LCD panel:
    • User can easily know if the MIC-420ATA is working normally and monitor the system status (network status, registering status) from the LCD panel display.
    • A “PKT Trace” function is supported to display the packets received on the LCD panel to let administrator find the network problem on line.
  • Call with or without proxy server (direct IP dialing) :
    • Following standard SIP protocol and is compatible with most of existing SIP Proxy server.
  • Provide easy configuration methods:
    • Very easy setting by keypads on the phone set.
    • Setting by web browser.
  • Support RFC-3261, TCP/UDP/IP, RTP/RTCP, HTTP, ICMP, ARP, DNS, DHCP, NTP/SNTP, FTP, PPPoE protocols
  • Interoperable with most of the existing SIP VoIP devices (IP-phone, gateway, proxy server) :
    • Please refer to the Interoperability List for the complete listing.
  • The LAN/WAN Port works for paralleled Ethernet cable and crossed Ethernet cable. HARDWARE SPEC



Phone Port

1xRJ11 connect to a telephone set. This telephone set can make PSTN call through the line port or VoIP call through Ethernet or modem connection.

Line Port

(Life line) 1xRJ11 as PSTN backup that connect to the PSTN line.
Built-in V.90 modem function (optional).

WAN Port

1xRJ45 10/100 Base-T Ethernet, line auto-sensing/switching.
Power Over Ethernet 802.3af function (optional).

LCD display

2x16 characters

Universal Switching Power Adaptor

Input: 100-240V AC
Output: +12V DC, 350mA




500 g

Operating Temperature

32 - 104 oF (0 – 40 oC)


10%-95% (non-condensing)

EMI Compliance


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