EchoLife ET655 IP Phone User Manual
2 Product Overview
8
Technical specifications
Table 2-4
Technical specifications of the ET655
Item
Specification
Lines
Four straight-through lines.
Supported protocol
Supporting the SIP 2.0, TCP/UDP/IP, HTTP, HTTPS,
PPPoE, RTP/RTCP, SRTP by SDES, HTTP, ARP/RARP,
ICMP, DNS, DHCP, NTP, TFTP, NTP/SNTP, and
SIMPLE/PRESENCE protocols
Supporting RFC3903, RFC3856, RFC3863, and RFC4235
Supporting RFC 3428
Up to 50 incoming IM messages can be stored. If more than
50 incoming IM messages are present, the system drops the
latest IM message.
Function keys
Eleven dedicated keys: Hold, SEND
,
SPEAKER
,
Headset Mode
,
TRNF
(transfer), CONF (conference),
MUTE/DEL, DND, INTERCOM, Phone Book, and
MSG (message)
Five navigation keys
Eighteen multi-purpose keys and four XML
programmable soft keys.
Device management
Supporting the upgrade of the NAT-friendly remote
software (through TFTP or HTTP) for the devices that are
deployed behind the firewall or the NAT
Supporting the address book function
Audio features
Handset, Hands-free, and headset modes in full duplex
Advanced DSP
Dynamic negotiation of codec and voice payload length
HD Voice
Supporting the G.723.1 (6.3K or 5.3K), G.729A/B, G.711
µ/A, G.726-32K, G.722 (broadband), and iLBC CODECs
In-band and out-of-band DTMF (in audio, RFC2833, or SIP
INFO mode)
Echo Cancellation
Supporting the sidetone cancellation, advanced jitter buffer
control, and packet delay and loss concealment.
