Hi. I have a client that is looking for an encrypted voip solution that uses a PDA-Phone of some sort to send the voice traffic over a Cellular broadband connection (EVDO, 3G, etc…).
Ideally, i’m looking for a PDA softphone that supports SRTP or ZRTP, but have had no luck so far in finding anything. An alternative solution would be to create a VPN between the cell phone and the VOIP server and then use something like SJPhone.
Has anyone done anything like this? I’d be interested in hearing your experiences.