Zoiper 3.12.1 For iPhone "Failed To Generate Request (12)" on T-Mobile iPhone 7

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Hello, just upgraded to an iPhone 7 running on the T-Mobile network and when trying to register an account in Zoiper 3.12.1 For iPhone i get a "Failed To Generate Request (12)" error only when using the cellular network, it registers just fine when locally connected on the same LAN. I am using this same version of the app on an iPhone 5 and 5C on the Verizon Wireless network with no issues. Could there be an incompatibility issue with the iPhone 7 or the T-Mobile Network? 


Thank You,

asked Jan 4, 2017 in iOS by Brien Morris (120 points)  
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1 Answer

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Some mobile operators restrict the use of VoIP in their networks. For more details check with your mobile vendor.

answered Jan 19, 2017 by Ivan (18,370 points)  
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