VP3302 IP Phone User Manual
1.2 Key Features
• Follows RFC-3261 SIP standard:
o Supports password authentication using MD5 digest and RFC-2833 for
DTMF relay.
• Dynamic IP support (DHCP and PPPoE):
o Gets IP from DHCP server using DHCP protocol or through ADSL
modem using PPPoE protocol, and automatically reconnects when
PPPoE loses connection.
• Passing through NAT devices:
o Can make outgoing and incoming calls under any NAT device (even
under two layer NAT devices) when working with the specific
gatekeeper/proxy devices.
• Remote software upgrade capability (via ftp):
o FTP protocol provides reliable remote upgrades through the Internet.
• Advanced Digital Signal Processing (DSP) technology to ensure superior
audio quality:
o Chip solution with built in DSP processor ensures perfect voice
quality.
• Supports G.723.1, G.729A/B, G.711 (A-law/U-law) voice codecs:
o Follows ITU-T standard to support best compatibility.
• Supports supplementary services, including immediate (unconditional) call
forwarding, busy call forwarding, no answer call forwarding and call
hold/transfer.
• Provides call history:
o Records incoming call history, outgoing call history, missed (not
accepted) call history, and let users make direct calls from call history.
• Phone Book: 50 sets
• Speed dial: 10 sets
• Supports Silence Suppression, VAD (Voice Activity Detection), and CNG
(Comfort Noise Generation):
o Silence suppression can save about half of the network bandwidth
needed during normal VoIP conversation.
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