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We browse websites using an HTTP proxy; there's no direct internet access. The only VoIP program that works out-of-the-box in our network is Skype and it's using that proxy too.
For example, I want to talk to someone who's using Linphone. Is it possible? Maybe through some web site.

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Do you want to call someone using Linphone or do you realy want to call someone who is using Linphone? –  douglaslps Oct 30 '13 at 10:10
    
the latter. I wrote exactly the same: "who's using Linphone" –  basin Oct 30 '13 at 10:49
    
Well, I'm assuming the person using Linphone is registered to a SIP provider therefore has a landline number for you to call. Can't you use Skype credits to call that number? HOw does that relate to the fact you are behind that HTTP proxy? –  douglaslps Oct 30 '13 at 10:54

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