Including a billing code or commas within the dialstring causes the outbound fax to fail with an error called 'Unknown error' when using GFI FaxMaker with a FoIP solutions.
- GFI FaxMaker
- Fax-over-IP (FoIP)
- Remove any unsupported characters from the dialstring such as commas, billing code(s) and any other characters than digits.
A "." and "," within a dialstring is allowed and supported in case where it will be interpreted as a pause by the PABX.
Any characters which are not supported by the PABX may lead to a failure of the outbound fax.