VoIP Switch PBX with 4 to 96 FXS/FXO ports inside SIP ... FXS local extensions; and 60 IP users in local or remote, support SIP and DDNS, Can be working under NAT; ... and analog extensions, and but VoIP based SIP trunks and remote extension as well. Using VoIP it allows calls from one ... purchased, it supports from 8 to 24 local extensions, 60 remote extensions, and 8 to 16 analog trunks. With its flash ...