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          Receive and make phone calls via PSTN lines using a VOIP Gateway | 
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          3CX Phone System does not require you to use a VOIP Service provider –  you can continue to make and receive calls on your existing phone lines  with a VOIP Gateway. There are numerous VOIP Gateway types and brands  and most of them are relatively inexpensive. A 4-port analog VOIP  gateway is available for a few hundred dollars, whereas a VOIP Gateway  supporting one or more E1/T1 connections starts at $3,000. Use any  quality brand – 3CX will never lock you into a particular gateway brand.
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