... , MD5), DNS name of server, Peer to Peer/ IP call·SIP support 2 SIP lines. Can connect to SIP1 and ... , DTMF Relay, RFC2833·SIP application: support Call forward/ transfer/ holding/ waiting / 3 way talking·Call control features: Flexible dial map, Hotline, ... Empty calling reject, Black list for reject authenticated call, limit call, No disturb, Caller ID·Support Phonebook 500 records·Incoming ...