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Could you please try disabling 'Automatic helper assignment' in Network -> Firewall -> General settings?
If this does not help, on the same firewall page, edit 'WAN => REJECT' zone, navigate to advanced settings and add SIP VoIP helper to Conntrack helpers.
I couldn't see this setting sadly... I am running a firmware upgrade to see if i can see it after?
Couldn't see this setting
Running a firmware upgrade on the router
To what firmware version have you updated your device? The latest firmware version can be found here.