Facetime Audio issue on EE UK (cellular connections)


i'm seeing issue facetime audio calls on ee cellular connections on ios 9.0.2.



after arbitrary time (usually 1->3 minutes) hear digital 'chirp' noise , call drops sound (stays connected, caller , cannot hear each other).



happens on ee 4g / 3g, not function of signal have healthy db of signal.



have worked ios developer , utran networks engineer few years, i'm pretty comfortable troubleshooting technical issues , after enomous amount of testing can replicate issue multipe devices on ee network.



wondering if many others seeing issue, , if it's result of ios protocol change or more fundamental how ft traffic being handled ee.



tried customer service, nice people kind of issue on heads. "reset network settings", yes mate, doesn't fix it.
 

anyone?
 


Forums iPhone, iPad, and iPod Touch iOS iOS 9


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