1.Support two SIP servers running at the same time
2.Redundancy SIP server capable
3.Support SIP/IAX2 protocol

     IP Phone system: CPH-662

     Features:

Support two SIP servers running at the same timeRedundancy SIP server capableSupport SIP/IAX2 protocolNAT, FirewallDHCP client serverSupport PPPoE (used for ADSL, cable modem connecting)Support major G7.xxx CODECVAD, CNGG.165 compliant 16ms echo cancellationE.164 dial plan and customized dial rulesTone generation and local DTMF re-generation accord with ITU-T Support inband audio, RFC2833 and SIP info etc. DTMF transmission modeHotlineSpeed dialCall Forward, Call Transfer, 3-way conference callsAnswering machineCaller ID displayDND (Do Not Disturb), Black List, Limit ListAuto-answer