... IP phone Sip support 3 simultaneous SIP lines or 1 IAX2 line Support phonebook 500 records Superior quality and competitive IP ... basic, MD5), DNS name of server,Peer to Peer/ IP callDTMF:Support SIP info, DTMF Relay, RFC2833Advanced Application FeaturesLarge ... no. reject service, blacklist for reject authenticated call, white list, limit call, no disturb, caller ID, CLIR (reject theanonymous call), ...