IP phone 6 Speed Dial Keys Base SIP Protocol with

Supports 5 navigation, menu, volume keys 13 dedicated function keys for hold, speakerphone, mute, transfer, conference and massage (with message indicator), 6 speed keys Supports SIP 2.0 (RFC 3261), TCP/UDP/IP, RTP/RTCP, ICMP, ARP/RARP, DNS, DHCP, NTP, PPPoE, STUN and UPNP Supports various codec’s including G.711 (PCM a- and u-law), G.723.1, G.729A and G.726 Supports standard encryption and authentication (digest using MD5, MD5-sess) Supports for layer 2 (802.1Q VLAN, 802.1p) and layer 3 QoS (ToS, DiffServ, MPLS) Supports silence suppression, VAD, CNG, G.168 and AGC Supports automated provisioning for mass deployment, RTP and TLS (pending) for security protection Supports automated NAT traversal without manual manipulation of firewall/NAT Supports numeric caller ID display, hold, transfer, forward, 3-way conference, in-band and out-of-band DTMF, call waiting, call log, off-hook auto dial, auto answer, downloadable ringtones, SMS (these function need SIP server supported) Supports direct IP call Direct IP calling allows two phones to talk to each other in an AD hoc fashion without a SIP proxy Supports syslog, full duplex hands-free speakerphone with advanced acoustic echo cancellation, redial, volume control, voice mail with indicator, downloadable ringtones