Thanks for the info. Seems as if there isn't much encryption opportunity in my situation, bearing in mind all my calls come from or go to the PSTN, which essentially means the VOIP part of my calls is always terminating at the SIP provider itself.
I'd hoped the SIP protocol had some sort of inbuilt encryption, so that the data traffic between me and the SIP provider could be encrypted, but seems not.
Martin - zFone & SRTP does indeed look promising, although my guess is it will face the same adoption hurdles that PGP email encryption faced - most people won't install or use it, because few people they communicate with have it installed either... a typical momentum problem.
It's a shame because one of the attractions of Skype is the inbuilt encryption. I know it's proprietary and closed-source, so no-one quite knows how good it is, but at least it's likely to stop all but pretty high-level man-in-the-middle eavesdropping.
Cheers,
Ben
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