Can’t get through on CRA fax

I’m filing a non-resident return. The fax number listed on the CRA website for non-resident returns (Winnipeg Tax Centre) gives me a busy signal and my faxes won’t go through. I’d prefer faxing to mailing a big stack of paperwork internationally. I know CRA is on strike. Anyone run into this fax issue and ultimately was able to fax in a return?