Key Specifications/ Special Features:

* Call features: block ( DND) , hold, transfer, forward, waiting and three parties conference
* Tones: ringtone, ring back, dial and busy tone
* DTMF functions: in-band, -audio and RFC2833
* Voice quality:
o Silence suppression
o VAD: voice activity detection
o CNG: comfortable noise generator
o AEC: acoustic echo canceller
o G.168: network echo canceller jitter buffer
* Codec: G.723.1, G.726, G.729A, G.729B and G.711 ( a-law/ u-law)
* STUN, media relay and automatic NAT traversal
* QOS: 802.1Q VLAN, 802.1P TOS and DiffServ
* IP assignments: PPPoE, DHCP and static IP
* Network protocol: SIP Version2 ( RFC3261) , TCP, UDP, IP RTP, RTCP ICMP, ARP/ RARP DNS, DHCP, NTP, PPPoE STUN and UPNP
* Security:
o HTTP basic/ digest authentication
o MD5 for SIP authentication ( RFC 2069/ RFC2617)
* Specifications:
o Adapter input: 100 to 240V AC/ 50 to 60Hz
o Adapter output: 5V DC/ 600mA
o WAN: 1 x RJ45 100 Base-T
o LAN: 1 x RJ45 100 Base-T
o FXS: 4 x RJ11
o FXO: 4 x RJ11
o Dimensions: ( L) 175 x ( W) 125 x ( H) 30mm
o Weight: 1.2kg