Netphonic Systems
NG-48 User Manual
5
z
Voice Codecs: G.711(A-law/U-law), G.723.1, G.729A/B, G.726
z
Redundancy SIP server (or Gate Keeper): Can auto swap address
between two servers address.
z
NAT penetration: Support STUN client, AVS and Citron etc. Can
modify SIP register port, HTTP server port, Telnet server port and
RTP port.
z
Support two SIP server synchronously: Can register two different SIP
server, and can make a call by either proxy.
z
Support standard voice features such as numeric Caller ID Display,
Call Waiting, Hold, Transfer, Do-Not-disturb, Forward, in-band and
out-of-band DTMF, Hotline (off hook autodial), ban outgoing.
z
Support standard encryption and authentication (DIGEST using MD5,
MD5-sess).
z
Support Silence Suppression, VAD (Voice Activity Detection), CNG
(Comfort Noise Generation), Line Echo Cancellation (G.168), and
AGC (Automatic Gain Control).
z
Provide easy configuration thru manual operation (Web interface and
Telnet) or automated centralized configuration file via TFTP or HTTP.
z
Support firmware upgrade via TFTP/FTP and HTTP.
z
Support syslog, can send event of gateway to syslog server.
3.2 Hardware Specification
The table below describes the hardware specification.
Item Specification
