3CX SIP 503 error
This problem emanated from 3CX showing the following error:
Call or Registration to 635195844@(Ln.10017@BizVoIP (Muyanalo Project)) failed.169.239.8.61 replied: 503 Forbidden RURI; from IP:169.239.8.61:5060
We see that your client is attempting to dial 635195844 as well as numerous other international destinations.
As seen in the attached trace, we receive a SIP 503 error from the destination side.
This indicated an issue with the destination side.
We made a few test called from mobile phones and received a "number does not exist" error.
When dialling international destinations, please check carefully that the numbers are being dialled correctly.
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