H.323 V4, MGCP, SIP, Net2phone private protocol Audio code G.711, G.723, G.729 DHCP support for LAN or Cable modem PPPOE support for ADSL or Cable modem Set phone by HTTP web browser (IE6.0) or Telnet Upgrade by FTP Support QOS function VAD(Voice active detect) CNG (Comfort noise generation) Dynamic voice jitter buffer G.168/165 compliant 16ms echo cancellation Tone generation and Local DTMF re-generation according with ITU-T E.164 dial plan and customized dial rules 100 entries for quick dial 80 entries each for missed calls, answered calls and dialed calls Adjustable volume for both handset and speaker Voice prompt Hotline Currency: USD Unit Price: Quantity: Delivery: