Product Name: VoIP Gateway / ATA / IADModel Number: GYZK-1000Place of Origin: ChinaKey features: 1) Supports SIP 2.0, TCP / UDP / IP, RTP / RTCP, HTTP, HTTPS, ICMP, ARP, DHCP, NTP / SNTP, TFTP protocols 2) Supports STUN and symmetric RTP for NAT 3) Interoperable with various 3rd party SIP end user device, Proxy/registrar server, and gateway products 4) Advanced 32-bit embeds MCU + DSP technology to ensure superior audio quality 5) Advanced adaptive jitter buffer control, packet delay and loss concealment technology 6) Support popular vocoders including G.723, G.729A, G.711 (a-law and u-law), G.726 (40K / 32K / 24K / 16K) 7) Supports standard voice feature such as caller ID display, call waiting, hold, transfer, in-band and out-of-band DTMF, three way conference 8) Supports silence suppression, VAD (Voice Activity Detection), CNG(Comfort Noise Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control)