file on PC - choose file from your PC to send as fax, may be in TIFF or PDF format.
file on server - choose file on Smartswitch server to send as fax, may be in TIFF or PDF format.
callee ID - B-number, which will be used to call to remote fax machine.
caller ID - А-number, which will be used to call.
In case if both file on PC and file on server are specified, Smartswitch loads file from your PC and saves it on server with specified name and sends fax after this.