UCM6204 support up to 500 users and 50/75 concurrent callsAuto Discovery and Zero Configuration of Grandstream SIP endpointsIntegrated 2/4/8 PSTN trunk FXO ports, 2 analog telephone FXS ports with lifeline capability and up to 50 SIP trunk accountsGigabit network ports with Integrates PoE, USB, SD cardSupports up to a 5-level IVR (Interactive Voice Response)Built-in call recordings server; recordings accessible via web user interfaceBuilt-in Call Detail Records (CDR) for tracking phone usage by line, date, etc.Supports multi-language auto-attendant and call queue to efficiently handle incoming callsStrongest possible security protection using SRTP, TLS and HTTPS encryptionSupports any SIP video endpoint that uses the H.264, H.263 or H.263+ codecsGTIN Number:6947273702122