User manual for a VoIP gateway covering hardware, installation, IVR, SIP settings and VPN features.
This manual introduces the VoIP gateway (ITG‑Internet Telephony Gateway), its hardware ports, supported codecs and basic operation. It explains the different models (2S, 4S, 8S, 16S, 32S, etc.) and how the device connects to PSTN and IP networks.
The guide provides step‑by‑step instructions for hardware installation, network configuration, IVR setup, SIP parameters, NAT/Firewall, QoS, VPN IPSEC and advanced options such as DoS protection and URL filtering. This manual is written in Chinese.
| Supported voice codecs | G.711, G.726, G.729A, G.723.1 |
|---|---|
| Power input | DC +12 V, 100 V‑240 V |
| Maximum ports | Up to 32 ports (32S/32O/16S16O) |
| Supported protocol | SIP |