Cortelco 2747 - Manual (Page 6)

5
o
Gets IP from DHCP server using DHCP protocol or through ADSL
modem using PPPoE protocol, automatically reconnects when PPPoE
loses connection.
• Pass 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 device.
• Remote software upgrade capability (via ftp):
o
FTP protocol provides reliable remote upgrade via Internet.
• Advanced Digital Signal Processing (DSP) technology to ensure superior
audio quality:
o
Hardware System on a 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 for best compatibility.
• Supports supplementary services, including immediate (unconditional) call
forwarding, busy call forwarding, no answer call forwarding and call
hold/transferring.
• Provides call history:
o
Records incoming call history, outgoing call history, missed (not
accepted) call history, and lets users make a direct call from the call
history log.
• Phone Book : 50 entries
• Speed dial : 10 entries
• Supports Silence Suppression, VAD (Voice Activity Detection), CNG
(Comfort Noise Generation) :
o
Silence suppression can save about half of the network bandwidth
needed during normal VoIP conversation.
• Ping function supported :
o
Pings another device on the Internet from the VOIP 2747 to make sure
the Internet connection is ok.
• System status display on the LCD panel :