1,support ITU H.323V4 and IETF SIPV2 2,eight ports SIM VoIP gateway 3,high quality speech ensured 4, ... /10Base-T x2 LED: Operation and lines light GSM Passway:eight Operating temperature: 10°C to 40°C (32°F to ... calling,Now you are calling with your customer by server eight ports SIM VoIP gateway