Hi @nickvsnetworking
I have good news for you. See attached patches, this allowed me send sync/async request to HSS and get the response. Also in the async mode event_route[diameter:response] was called and processed. [avp_helper_patch.txt](https://github.com/kamailio/kamailio/files/5919202/avp_helper_patch.txt) [ims_diameter_server_patch.txt](https://github.com/kamailio/kamailio/files/5919203/ims_diameter_server_patch...)