Yes, I’ve worked with FlyingVoice gateways (G508 and G504 models). Overall, they’re quite stable once properly configured. For Avaya environments, I’ve seen better results sticking with the original FlyingVoice firmware, as Avaya-branded versions can be more restrictive or outdated depending on the release channel.
Just make sure you’re running the latest stable firmware from FlyingVoice’s official site, and double-check SIP compatibility settings if integrating with Avaya IP Office or CM. Once set up, they tend to be reliable for FXS use cases like analog phones or fax.
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