I was calling a Rogers (Fido) mobile today using a Betamax provider and I ran into the same problem. I could hear the called party, but they could not hear me.
I used another provider (Voicestick) and the call worked fine.
Maybe this is not the kind of solution you prefer, but some things are not necessarily worth the effort. It is a goodidea to have one or two backup providers, just in case the lowest cost and preferred provider is not available.
Hope that helps ...
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