The Quadro 4X IP phone key enables up to 16 additional local IP phone extensions on the Quadro 4X bringing the system to 46 total IP extensions. An addtional key purchase of 16 IP phone extension can bring the Quadro 16x to a maximum of 50 total IP extensions. These IP extensions are in addition to the 4 analog FXS compatible phone extensions. For optimal compatibility, please see the list of Recommended Phones for the Quadro 4X.
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Telephony, PBX & VoIP > Phone Systems > Business Phone Systems by Brand > Epygi IP PBX Phone System