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Hello JorisR_3CX,Hi,
You can check that the inbound parameters of your SIP trunk are correct (created a fake "new" trunk with this provider to check the default setting) .
If it is correct, You should make a wireshark capture of an inbound call to verify that your provider is sending you a callerID or not. If not you should then proceed to contact them to see if anything can be done on their side.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.