Call forwarding from Cell Phone to 3CX DID not working

[RobArnett CNR]

I have a customer that wants to forward a Cell Phone to their DID at work. Cell Phone coverage is not great. I set this up on mine V18 and it works with no issues. But when i set it up on the Customer V20 Hosted at 3CX the calls can not be completed.
If you call the DID directly the calls come in with no issues.
Error:
Level
Warning
Event ID
30051
Date & Time
03/13/2024 12:43 PM
Details
Unidentified Incoming Call. Review INVITE and adjust source identification

30051

Unidentified Incoming Call. Review INVITE and adjust source identification: %1.

Warning

This is a problem when the Source is not trusted. 3CX expects SIP call traffic to come from a certain IP Address and with a certain format and fails to satisfy 3CX checks. For security purposes 3CX will not allow this request and show this message.

 

[OlegR_3CX]

Hi there.
You can open a support ticket, and we can review the logs and settings of your Phonesystem and then be able to advise you, as this information is not enough if we don't have the other data.

Thank you