i have been there on the way and couldnt get my laptop/nokia e65 work there to make voip calls. after i press the call button with i. e. voipdiscount, it says 'you are not allowed to make this call'. i leanr later that all ports are blocked.
but you can try to use some vpn (virtual private network) to bypass the port. my ip ranges here in sweden are blocked by betamax (many people registered to betamax in this area and betamax blocked all the ip range *.*.*.1-255 for all betamax services.) but i am able to make the calls by creating a vpn connection to my university letting the betamax know that i am caling from university's IP.
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