1. Support H.323 V4,SIP v2.0 (RFC 3261),MGCP (RFC 3435)
2. Codec: G. 711,G.723.1,G.726 and G.729A/B
3. Built-in Router function
4. Hybrid echo cancellation G.168 (16 ms)
5. Auto switch between Fax and voice
6. DTMF tone detection/regeneration
7. Comfort Noise Generation (CNG)
8. User programmable Call Progress detection/generation
9. Voice Activity Detection (VAD) Facsimile protocol (option): T.38
10. Real-time fax over IP
11. DTMF tone detection/regeneration HTTP Server
TFTP and flash memory for remote software download and upgrade

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It is a VoIP gateway with built in router, usually people call it a VoIP gateway router, the voip gateway needs a regular IP phone to support, a support platform is also needed for the voip gateway, there is a RJ11 port for the regular PSTN call on the Gateway,
When people use the VoIP gateway, they can use their regular PSTN service as well, since the VoIP gateway (STC-G02) is able to switch from the regular PSTN to VoIP, as well as Switch the VoIP to regular PSTN Service.
There are two classes of the series VoIP gateway, the one is VoIP gateway with single RJ11 port, while the other is VoIP gateway with dual RJ11 port.
People may choose whatever they like to have.
The VoIP gateway router owns a function of broadband router as well.