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ISP blocking the VOIP traffic


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I just like to get experience from other providers, we have  situations whereby certain providers in the UK like Three Networks, EE and Sky ISP  are blocking VOIP traffic. we opened support ticket with Vodia changing the SIP ports from the default but that has not resolved the issues . The main issue is when we connected either on Apps/Voip handset we have one-way audio.  When we install VPN , the service start working.

But we like to avoid users downloading VPN software just to use the service . We will appreciate if you can share your experience and best practice.  Thanks.

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