David:
We used to have a syncReply attribute under both QualityOfServiceInfo and
Via. We determined that the one under QualityOfServiceInfo is not needed
because it should be obtained from the CPA.
The Via element is essentially renamed as SyncReply because once we removed
the TraceHeaderList, syncReply is the only attribute that is left in Via.
Because the sender may not be aware of the presence of SOAP or MSH
intermediaries, it should always include a syncReply element in the message
header if the CPA specifies any syncReplyMode other than 'none'.
Regards,
-Arvola