This implies that you have configured the phone to use STUN and you phone is now bound to the RPS server. Edit your extension and navigate to the Options tab. Make sure that the option "SIP request (REGISTER) from 31.151.XXX.XX was rejected. Reason: Block WAN requests is ON. Message: REGISTER sip:voip-w2g.3cx.nl SIP/2.0 Via: SIP/2.0/TCP 192.168.178.248:63778;branch=z9hG4bK-d87543-7458502e3b220925-1
If you have an SBC then don't use STUN, it is more complicated and requires more port forwarding.
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