Using Cisco SPA-122 and Cisco SPA-8000 Devices with 8x8 for Faxing

We purchased 3 Cisco SPA-122 devices and 1 Cisco SPA-8000 device from 8x8 to test out 5 new fax lines (3 incoming and 2 outgoing) vs. using local Charter numbers with GFI Faxmaker 14. We started our test back in January and February 2014. We did this to compare cost, QoS and overall network overhead against hosting and running GFI Faxmaker 14 internally. Initially, we encountered no issues purchasing or setting up the Cisco SPA-122 and SPA-8000 devices and we were happy because it was cheaper to go with 8x8 than GFI Faxmaker 14. However, about a month into the test, we started to encounter frequent line congestion/noise and disconnect with the Cisco SPA-122 and Cisco-8000 devices and we eventually had to restart the devices every day during non-business hours in order to reset the device and purge out pending faxes. For 3 weeks, we tried to get replacement devices from 8x8 but they wouldn't send us any because we were considered residential customers and defective equipment for residential customers wasn't covered under warranty replacement. Finally, after 2 weeks of contact from support and lack of concern from 8x8, we cancelled our service with 8x8 and went back to using Charter and GFI Faxmaker.