DrayTek VigorTalk Internet Telephony Adapter 1 LAN, 1 telephone port(FXS), SIP, G.711, G.729 A/B.

Leverage your existing broadband connection for lower Internet phone rate.
Carrier-class-clear sounding and high quality voice communication while surfing Internet.
Taking full advantage of the features afforded by service provider: Caller ID, Call Waiting* etc.
Capable to be large-scale deployed by service provider.
* Future release
1. Voice over IP Protocol : SIPv2 ( RFC3261 ).
DTMF : inband & outband ( RFC2833 / SIP INFO ).
Call progress tone generation.
Dynamic jitter buffer ( adaptive ).
Packet loss concealment.
Full duplex audio.
G.168 Line Echo-cancellation.
VAD - Voice Activity Detection w / silence suppression.
Caller ID generation - Bellcore, DTMF, ETSI.
Voice codecs: G.711 A / µ law ; G.729 A / B.
Gain control.
2. Administration, Provision and Management Password protected system reset to factory default ( Telnet ).
Password protected access Web configuration.
Web-based configuration via built-in Web server.
Convenient Internet access profiles.
Touch-tone telephone keypad configuration with IVR support .
Auto provisioning.
Firmware upgrade via Web browser.
3. Networking Features DHCP client ( RFC 2131 ) / PPPoE / Static IP.
PPTP support.
Automated NAT Traversal ( STUN, RFC3489 ).
RTP/RTCP ( RFC 1889,1890 ).
4. Physical Interfaces One port, 10 / 100Base-T, RJ-45 connector.
One port, FXS, RJ-11 connector.
5. Regulatory Compliance FCC Part 15 Class B.
6. Indicator Lights LAN LED ( ready / transmitting ).
Status LED
green : solid while off hook ; blink while ready .
orange : solid during IVR configuration; blinking during VoIP communication.