... support up to 500 users, SIP supported, default with 100 user license. AC power, 1U height. It has ... , support up to 2000 users, SIP supported, default with 100 user license. AC power, 1U height. It has ... support up to 2000 users, SIP supported, default with 100 user license. AC power, 2U height. It has ... support up to 2000 users, SIP supported, default with 100 user license. AC power, 6U height. It has ...