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Sophos XG site to site VPN interfering with SIP trunk

Hello,

I'm currently running a trial version of Sophos XG at home and I'm having a problem with my SIP trunk. I use a FreePBX box that is connected to trunk provider Flowroute.

I believe the site-to-site ipsec VPN tunnel connection to our office is interfering with my sip trunk. I have specific firewall rules enabled for QoS and all of the required SIP and RTP ports. I have also disable the SIP helper module via the console. The connection works great with Flowroute. But, as soon as I enable the site-to-site vpn tunnel, it knocks down my connection to Flowroute. I can't reestablish the connection without rebooting the firewall and disabling the VPN connection.

I'd really like to get this issue resolved before purchasing a second box. Any ideas what may be causing this?

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