The QX50 is designed for offices of up to 50 users supporting up to 16 concurrent calls (as many
as four through a VPN tunnel). This system is equipped with two FXO PSTN ports and two FXS
analog station ports. Additionally, the QX50 can support SIP trunking with no additional licensing.
Manufacturers Warranty - 12 Months from purchase date with proof of sale. Optional additional 3 yrs of warranty available for purchase, for total of 4 years.