NTL has recalled domestic direct telephone equipment services in Dublin after the company said it had identified a "safety issue".
Fine Gael Senator Mr Brian Hayes today called on the communications regulator, ComReg, to compel NTL to explain the nature of the security risk.
"NTL ordered customers to disconnect their phones at the weekend with very little advance notice.
"With reports that some customers have refused to disconnect their NTL telephone lines, it is imperative that all the facts are made known," he said.
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NTL has said it will pay the reconnection fee for its affected customers, but the company has not yet provided further details of the safety issue.