Polycom HD Voice technology
Acoustic Clarity Technology

255 x 128, White LED backlight

Encrypted configuration files
Password login
Transport Layer Security (TLS)
Digest authentication
HTTPS secure provisioning

IETF SIP (RFC 3261 and companion RFCs)

Low-delay audio packet transmission
Voice activity detection
Acoustic echo cancellation
DTMF tone generation / DTMF event RTP payload

FTP / TFTP / HTTP / HTTPS
Ethernet 10/100 Base-T

1 x USB 1.1

12-key keypad

1080

-30 ~ 55

20 ~ 85 %

39.4 x 37.2 x 7.3 cm

IEEE 802.3af Power over Ethernet (built in)

0 - 40

Local feature-rich GUI