Possible bug(s) with nlapiSendFax()

Every time I dig-in and get ready to use this method I find something wrong.

From the help:

body {string} [optional] - Body of the outgoing fax

OPTIONAL

My code:

 nlapiSendFax( -5,      '949.724.1191',      'non-internal recipient test',      null,      { record:'467', recordtype:'35' },      result); 

Results in:

SSS_MISSING_REQD_ARGUMENT

This code:

 nlapiSendFax( -5,      '949.724.1191',      'non-internal recipient test',      'This is the body!',      { record:'467', recordtype:'35' },      result); 

Doesn't throw an error, but it also doesn't attach the fax and the fax never actually arrives.