Hi,

I've got an interesting problem similar to a very old post but didn't want to resurrect it:  HELP! - RTP traffic causing lockup of Vigor2927 - DrayTek Forum

The situation is almost exactly the same; multiple sites connected via LAN to LAN IPsec VPNs, SIP traffic going through an SBC on Site 1, at roughly the same time (give or take 30mins) every day the whole system loses connectivity and needs to be rebooted to fix.

4.5.2 Firmware running on each router.

Anyone have any ideas what might be the cause of the issue? Couldn't find an answer anywhere.