... provides a flexible network configuration, powerful features, and good voice quality. It works for carrier grade, enterprise, SOHO, ... SIP server. 1. PLC: Packet loss concealment2. VAD: Voice activity detection3. CNG: Comfort Noise Generation4. Local/Remote SIM ... Adjustable gain of port6. DTMF adjustment7. Balance alarm8. Lock/unlock SIM/UIM 9. Mobile number display rejection10. Sending/receiving ...