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Problems with faxes and digital voice

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Problems with faxes and digital voice

We have had ongoing problems with faxes.  We have manually turned down our fax speed to V.17, which allowed the fax to work some of the time, but our transmissions and received faxes look terrible.  When we plugged back into an analog line, the transmissions and receptions are fine, so it's not our fax, equipment.  It appears to be a problem with the digital voice lines not being up to sending or receiving faxes reliably.  Is there any adapter or upgrade to solve this?