TL;DR - What negative affects occur with a UDP timeout value too high? Simply more Resource usage on device or other unintended consequences?
We have a Sophos XG Firewall and have VOIP Issue over a S2S VPN with phones dropping, screen freezing, no dialtone and other odd issues.
We've increased UDP timeout to 300 previously as per KB's online which fixed calls dropping out, however the other issues still occur (albeit very rarely - sometimes once per day, several times a day or not at all).
Network is stable over VPN with no loss including pinging each handset, however I did find a thread that stated if the phone is not used, the connection on port 2727/2427 for MGCP drops and this posted has a near identical issue however trails off without a resolution. Looking into this is appears to fit our issue.
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