Thanks for all the input! To clarify: I have already set this this system up using linux/win/mac IAX clients and it works great. Reliability is very high (no failures within the 4 months I've had it up) with my dedicated asterisk server running off my DSL connection (QoS on with a linux router). If the asterisk server cannot reach me via a VoIP connection, it fallsback to calling my cell phone number. If the asterisk box fails for whatever reason, my VoIP provider has a fallback number to dial as well. The asterisk server just has a VoIP account for inbound and outbound calls, no analog lines are connected.
The cost benefit here would be the ability to accept a lower plan from your cell provider (possibly data-only when 3G is available?), or even use a prepaid service with the smartphone. I am currently using a per-minute VoIP/POTS termination plan with no monthly fee, which works out to be much cheaper with the lower cellular plan. I have not wrote the application as of yet, I wanted to gauge interest for a project like this. If I do write this application, I would like to implement encryption along the way. In addition, I would set up an asterisk box at our business location for testing within a larger userbase. The reason I prefer to use a full asterisk system is the ability to integrate it within our business. I prefer IAX over SIP because it is NAT routeable, whereas SIP has many issues with firewall traversal. In reality, the client should support both. Keep it coming! :-) -Kyle
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