Can depend on where exactly dial tone is being lost and which cabonet is being referred to. If it is between original PCP and DSLAM cabinets then it is unlikely to affect VDSL, if between DSLAM and PCP or PCP and premises then it will affect it.
If the cause is a single leg disconnected then you will usually continue to get a VDSL service, albeit seriously degraded.
So, wait until that problem is resolved before you try to resolve any VDSL issues.
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