... Billing, Recording, Voice mail Tie trunks for multiple IPPBXs Embedded IP PBX with 4,8 or 16 FXO ... analog ports, and 8,16,24 FXS local extensions; and 60 IP ... users in local or remote, support SIP and DDNS, Can be working under NAT; based on Linux OS, GUI for ... built-in IVR, calls records, and downloads for color ring back tones.Model NameAnalog ExtensionsAnalog TrunksSIP ...