I work for a FTTx provider. We can deliver Ethernet SIP trunks to a business but some have old key and PBX systems that require 1FB or ground start lines. Can anyone recommend a good, reliable interfacing hardware that converts SIP trunks to loop or ground start trunks? We are thinking of trying another vendor and want someone with a good track record of interfacing with a lot of different PBX brands.
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