Likely no it is a violation of the FDCPA lawyer. It is only if you don't show up to court for a citation to discover assets. Speak to a consumer lawyer and bring a copy of the voicemail to the consult or speak with them over the phone. You likely can sue them for the violation and get the attorney fees paid by the creditor.
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My colleague is correct, you should immediately consult a local FDCPA attorney. It is improper behavior for a collector to threaten a debtor with jail for an unpaid debt. We do not have debtor's prisons in the US. The voicemail and any other information surrounding the debt at issue should be reviewed to see if you have a remedy available.
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