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Cisco VOIP drops calls every since I had SIRO installed

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Hi - I have a CISCO 8865 VOIP at home since I work from home.  I have had this 3 years w/o any problems - used to have Virgin Broadband.  Ever since I moved to SIRO the calls drop after 15minutes.  I got a new phone sent out to ensure it wasn't the phone but the new one drops as well.  Cisco has verified on their end and nothing chnged - just happens since i have SIRO connected.  I need someone to check on settings - I get an error message:


TCP-Timeout message and it only happens since I moved to SIRO. C an someone please take a look ? thanks

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