[Descripition] Protocol support: SIP(RFC2543, RFC3261) CNI 520 is cordless IP phone integrated with DECT cordless, VoIP and PSTN, it is used for Household, SOHO, and Enterprise. [Features] IETF SIP V2 (RFC3261) Five cordless phone register supported DECT cordless, VoIP and PSTN supported DHCP / PPPoE / Static IP addressing; Bridge (Switch Mode); NAT; NAT/FW Traversal; TCP/IP; SIP; RTP; RTCP; DNS; FTP; HTTP; DTMF; SNMP [Specifications ] 1.88-1.90GHz Call Timer; Speed Dial - 10 Numbers Max; Redial; Incoming Call with Number Displaying; *Call Transfer; Call Forward - Unconditional / No Answer / on Busy; Do Not Disturb; Call Log - Outgoing, Answered, Missed Calls (Each 60 Entries); Digital Answering Machine; Configurable Ring Tones; Adjustable Ring Volume; Date and Time display (Manual / SNTP) Encrypted (AES/DES) Voice Communication; Password Protected for Configuration; MD5 for SIP Authentication.