Are there standard approaches to making voip/sip halfway secure (no worse than 2G)? Or do you just have to tunnel/vpn it?
Are these protocols you can use (directly or with a gateway/proxy) with normal sip-based voip providers?
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Not so concerned about E2E here because normal cell calls don't have E2E anyway. Aim is just "no worse than" normal cell.
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No, everything past the eNB is transparent to the phone. There are provisions for corporate APNs but I don't remember much now
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