T2 Signed or Unsigned Acknowledgement

David,

Section 10.3.3 says an Acknowledgement Message MUST be generated if
deliverySemantics is set to OnceAndOnlyOnce and . . .

If AckRequested is not present, should the Acknowledgement be Signed or
Unsigned?  We could base this upon whether the Message was signed or unsigned?

Regards,

David Fischer
Drummond Group.