With 8 telephone interface ports‎,‎ the GXW4108 FXO Analog Gateway from Grandstream Networkshelps bridge the gap between traditional telephones and VoIP phone systems‎.‎ This gateway supports PSTN/PBX analog trunk lines‎,‎ along with an SIP trunk interface‎,‎ to effectively convert traditional PSTN‎-based telephone calls into a VoIP signal to be transmitted over an IP‎-based connection‎.‎ In addition to 8 telephone ports‎,‎ you can also take advantage of a dedicated video surveillance port complete with support for real‎-time video feeds‎,‎ CIF resolution‎,‎ and a 30fps frame rate‎.‎