[SR-Users] Normal behaviour with loose_routing

Hi list, I have a setup configurered has diagram below: UAC -> Proxy LB (proxy lb) -> Proxy Router/registrar (proxy B) -> Asterisk SBC My UAC is SIPP and sending a classic call scenario: INVITE - ACK - BYE. But i have some trouble to understand which queries should be loose routed and which queries should be dispatched by dispatcher module. My first invite request has been dispatched to proxy B by proxy LB. After that, ACK and BYE request should be loose_routed or should be dispatched as other request ? My proxy B is a statefull proxy, logging cdrs and other stuff ... dialog informations consistent. My subsequent requests have record-route headers. Should i use theses headers to route my calls ? Loose routing features only work with "Route" header ? What is the difference beetwen Route headers and Record-route headers ? Thanks in advance, Regards.