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I haven't been able to find anything about phasing out sound powered telephones or a system called IVACS. Can someone provide a reference? Rex07 02:59, 4 January 2007 (UTC) reply

Why would the Navy want to phase sound powered phones out? What could you possibly replace them with that doesn't need any external power to operate? JDZeff ( talk) 07:33, 17 November 2021 (UTC) reply

Need a reference for 30mi range. A brief web search shows ranges of around 4 miles. Rex07 03:56, 23 January 2007 (UTC) reply