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3CX Phone System for Windows System for Windows
Page 44
4.
If the DID number is not present in the “To” header, you will have to check the
documentation of your VOIP Gateway to find how you can configure it to insert the
DID number into the “To” field. In the case of a VOIP Provider, contact your VOIP
provider for more information.
5.
If the DID number is present in the “To” header, check whether the string listed in the
“To” field matches the string you configured in the rule. Adjust accordingly and try
again