External Send or FAX for shipment info to Customers

Hi,

i already posted a question on this but no replies... trying my luck again...

A very simple question..

Do we need to use function module SO_NEW_DOCUMENT_ATT_SEND_API1 even if we configure the output type for transmission medium 5 (External Send).

Std SAP output type for shipments CPAC uses the Processing Program RLE_TRA_CONFIRM_STATUS and i dont see any code for the above function module.

Appreciate your early reply... Helpful answers will be rewarded..

Tanuja