Product Description
IAD18
Functions        
Configuration        16-48 FXO and FXS ports
Voice processing        Voice codec: G. 711, G. 729A, G. 723.1, GSM, iLBC
Echo cancellation: G. 168with 64ms echo tail
Dynamic jitter buffer, voice activity detector(VAD)
QoS: IP TOS, IEEE 802.1p tag
Call features        
Calling type        Voice/Fax/Data
IVRvoice prompt        FXO port 2-stage dialing
Encryption        RC4 and other encryption scheme for signaling and/or voice
Call handling        Configurable dialing plan, up to 500 routing rules
Fax processing        T. 30, T. 38 fax relay
DTMF        RFC 2833, SIP INFO, audio
Billing        RADIUS, polarity reverse
User features        Caller ID, call forwarding, call transfer, call forking, hotline, CRBT, do not disturb, speed dialing, busy tone detection
Network        
Security        IP filter, port number changing
NATtraversal        Static, dynamic, STUN
Protocol        PPPoE, DHCP, DNS