Why the fax can't be sent out due to "Invalid Fax File" When I send a fax from the Client?
Please double-click the "Invalid fax file" fax item to see whether it can be opened.
If it can, there must be an Init string problem.
Please refer to: here to select another init string.
If it can, there must be an Init string problem.
Please refer to: here to select another init string.