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Re:Government obtains wide AP phone records in probe by aasarava on Monday May 13, 2013 @06:17PM (#5701784)
Adding to your question, it seems there are two things that are needed: Reducing reliance on a third-party service (phone company, Skype, etc.) that may keep call records which can be subpoenaed; and encrypting the conversation itself so it can't be monitored.

It seeems there are "crypto phones", but do these still rely on a third-party service to initiate and transmit the call? http://en.wikipedia.org/wiki/Crypto_phone

Re:Government obtains wide AP phone records in probe by Zikes on Monday May 13, 2013 @06:21PM (#5701808)
From what I can gather, those crypto phones will encrypt the communication but the identity of the two parties and the duration of the calls would still be known.