I install Grandstream PBXs, i probably installed 100s, from 6102 to HA 6510 with HA100.

I do not really recommend this product, use a workstation computer with VitalPBX.

CDR issues, backup issues, storage issues, grandstream has a tendency to send unfinished products to market.

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I’m grandstream certified, vitalpbx reseller, DM if you need any further infos or help