... the same connection to a LAN or the Internet. IP Phone FeaturesThe comprehensive software features and superior voice coding ... Unconditional, When busy, When no answer),Call wait, Call hold, Call pickup, Multi-way conference, DnD, Call block, etc¨ Primary and backup server ... ¨ RTP/RTCP: RFC3550(Compatible RFC1889/RFC1990)¨ SDP: RFC2327¨ TCP/IP, PPPoE, DHCP, NAT, Bridge, IEEE802.1p/Q¨ SNMP,TFTP ...