Martin,
Thanks for doing that. I tried to open an account at sipsorcery.com but they are not presently accepting any new users.
In order to discover what makes the difference between FUP and non FUP calls, I propose that jozef make two calls through the same Voxalot proxy. One call would be without the extra something from sipsorcery so that it will have FUP charge. The other call would be with sipsorcery in the way that avoids FUP charge. jozef could send you the date/time and destination number of both calls so you could more easily locate them in your logs. After comparing all SIP packets from both calls we may be able to discover what makes the difference between FUP and non-FUP calls at the one proxy that is possibly not on Betamax's whitelist.
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