Voip Gateway For Network Communication

Advanced Functions:
VOIP Gateway can register to two SIP server synchronously,one IAX2 systems and a PSTN number, it has 3 VOIP number and 1 PSTN number, that means one phone has 4 numbers
Call waiting, call transfer, 3 ways calling, many modes call forward
Switch outgoing call freely between VOIP and PSTN
Incoming display, forbid call out; setup avoid-disturb, auto answer, off hook auto dial, quick dial
Setup blacklist number and limit number
Support point-to-point call
Setup the end number method
Setup fixed call method
Support Silence Suppression, VAD (Voice Activity Detection)
Support CNG (Comfort Noise Generation)
Support Echo Cancellation and AGC (Automatic Gain Control)
Support Polarity reversal
Support VPN (L2TP), can be used in the VPN special network
Support SIP register failure detection, offer busy tone, when the telephone is out of order
Support line detection, busy tone when no line available
Configuration, management and maintenance:
Support post mode and can update gateway via post mode
Support to operate and configure the gateway by keyboard and Http mode, and support the filtration restriction on user IP address
Support to update the software and configuration via HTTP, FTP, TFTP
Support multi-administrator management, user name, password
Support reversal Telnet through NAT/ Firewall to manage long-distance.