Merge "res_pjsip/pjsip_distributor.c: Add missing off-nominal request response."...

diff --cc res/res_pjsip/pjsip_distributor.c
index 14e540dc16d974c0212a94368c17bafb0f0113f4,8a45ddbf6a407bfb7c26f2bc512d411b448ed241..0d3b12247a3d9da0a3f01a552bd545f9757df4fc
--- 1/res/res_pjsip/pjsip_distributor.c
--- 2/res/res_pjsip/pjsip_distributor.c
+++ b/res/res_pjsip/pjsip_distributor.c
@@@ -724,16 -721,15 +724,17 @@@ static pj_bool_t endpoint_lookup(pjsip_
                        ao2_ref(unid, -1);
                } else if (using_auth_username) {
                        ao2_wrlock(unidentified_requests);
 -                      /* The check again with the write lock held allows us to eliminate the DUPS_REPLACE and sort_fn */
 -                      if ((unid = ao2_find(unidentified_requests, rdata->pkt_info.src_name, OBJ_SEARCH_KEY | OBJ_NOLOCK))) {
 +                      /* Checking again with the write lock held allows us to eliminate the DUPS_REPLACE and sort_fn */
 +                      unid = ao2_find(unidentified_requests, rdata->pkt_info.src_name,
 +                              OBJ_SEARCH_KEY | OBJ_NOLOCK);
 +                      if (unid) {
                                check_endpoint(rdata, unid, name);
                        } else {
 -                              unid = ao2_alloc_options(sizeof(*unid) + strlen(rdata->pkt_info.src_name) + 1, NULL,
 -                                      AO2_ALLOC_OPT_LOCK_RWLOCK);
 +                              unid = ao2_alloc_options(sizeof(*unid) + strlen(rdata->pkt_info.src_name) + 1,
 +                                      NULL, AO2_ALLOC_OPT_LOCK_RWLOCK);
                                if (!unid) {
                                        ao2_unlock(unidentified_requests);
+                                       pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
                                        return PJ_TRUE;
                                }
                                strcpy(unid->src_name, rdata->pkt_info.src_name); /* Safe */