... Billing, MOH, IVR, Recording All-in-One SIP IP PABX for SOHO useressupport 4 to 96 analog ... and 60 IP users in local or remote, support SIP and DDNS, Can be working under NAT; based ... trunks and analog extensions, and but VoIP based SIP trunks and remote extension as well. Using VoIP ... 20 4 60 60 System Features Built-in SIP Server SIP Trunk Auto Attendants Distinctive Greetings Greeting Mode Scheduling ...