... in router, NAT, gateway Features:This VoIP ATA can make/receive VoIP and PSTN call.Built-in router, NAT ... SIP soft phone and terminal unit.Support various voice codes including G.711U, G.711A, G. ... set flexible.Support silence suppression, VAD(Voice Activity Detection), CNG (Comfort Noise Generation), line echo cancellation (G.168), ... , 1200mAOperating Temperature:0~40Relative Humidity:10% - 95% VoIP ATA