If that's really your complete Kamailio config, it's missing a number of critical checks and handlers, such as loose_route(), which handles sequential (in-dialog) requests differently from initial requests due to the presence of a Route: header and a To header tag.

You can't just stick cr_route() in the main route { ... } block without those canonical checks and expect everything to work as desired.

The reason that the proxy is not seeing the sequential requests (reinvites, BYE, etc.) is because you don't have a Record-Route header, which tells the endpoints to relay sequential requests through the proxy on the network and transport level.  Add this to your initial request route prior to (cr_route())[1]:

if(!is_method("REGISTER|OPTIONS|MESSAGE"))       record_route();

That should take care of it.

-- Alex

[1] And ideally, add quite a few other things as well.  See the     stock configuration file for more insight.

Thanks Alex. I am testing this in the lab so I don't have a production config loaded, I am really focused on the carrierroute module and trying to figure that out so I'm running bare bones using the module example. I looked into the RR functions and read in the CR module that it invokes the TM when necessary so I was thinking it would take care of keeping track of dialogs. The thing that threw me off was the handling of the scenario 1 session with sipp was ok but with asterisk scenario 2 it was not.

So I loaded in the record_route function in the main routing block and it did take care of the complete session with the asterisk server, so that problem is solved.

What I am running into now is the failure route. If the initial session can not compete to the fist carrierroute, the call switches over to the failure-route[1] which invokes carrierroute again with another domain. Then the receiving asterisk server retransmits the initial OK 6 times, so the transaction is lost or not held in kamailio state, then the whole session drops after a few more seconds. I think there is something going on with the append_branch function that is throwing me off. It is needed so the failure route completes but it's not handling the complete dialog or I could be totally off.

Thanks.

JR