Well you can use as well, as “receive protocol”, not only Broker/JMS but also a “Simple Service”.
The “Simple Service” can be a webservice, however the downside from this implementation is that this is a synchronous path, so you need to implement in the process a reply step which is sent back.
You can start a process model from TN, and as far as I know you need the conversationID.
Regards.
#webMethods-BPMS#webMethods#BPM