Grandstream GXW-4248. as you can conclude by its very name. it supports up to 48 FXS ports. This VoIP gateway is used for connecting the analog devices of phones and fax machines that remain in the same network with each other. This device has support for a wide range of Voice and Fax codecs. This is combined with 48 RJ11 FXS ports in addition 50 Pin Telco Connector. All of these features combined. these make the GXW4248 the most powerful VoIP Gateway offered by Grandstream. The credit also goes to its versatile set of uses.This is defined as the next generation high-performing 48 Port VoIP Gateway that is compliant with the DSIP standards is working completely fine with other VoIP systems. Analog PBX and phones that are available on the market. Moreover. this device features the multiple FXS analog telephone ports that are well complimented by the voice quality and dialling plans. All of this is topped up with improved security standards for this device as it proves to be a great opti