UCM6202 and UCM6204 support up to 500 users and 30/45 concurrent calls,
UCM6208 supports up to 800 users and 100 concurrent calls
Auto Discovery and Zero Configuration of Grandstream SIP endpoints
Integrated 2/4/8 PSTN trunk FXO ports, 2 analog telephone FXS ports with
lifeline capability and up to 50 SIP trunk accounts
Gigabit network ports with Integrates PoE, USB, SD card
Supports up to a 5-level IVR (Interactive Voice Response)
Built-in call recordings server; recordings accessible via web user interface
Built-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 calls Strongest possible security protection using SRTP, TLS  
and HTTPS encyrption Supports any SIP video endpoint that uses the
H.264, H.263 or H.263+ codecs
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