config tweaks to ignore errors post session progress and ignore MESSAGE for now

kamailio/default.cfg

@@ -23,7 +23,8 @@ flags
     FLAG_ASSOCIATE_SERVER:    2,
     FLAG_SKIP_NAT_CORRECTION: 3,
     FLAG_ASSOCIATE_USER:      4,
-    FLAG_TRUSTED_SOURCE:      5;
+    FLAG_TRUSTED_SOURCE:      5,
+    FLAG_SESSION_PROGRESS:    6;
 
 #!define FLB_NATB 1
 #!define FLB_NATSIPPING 2
@@ -220,6 +221,8 @@ route
 
     route(HANDLE_OPTIONS);
 
+    route(HANDLE_MESSAGE);
+
     route(HANDLE_MOVE_REQUEST);
 
     #!ifdef PRESENCE-ROLE
@@ -291,6 +294,17 @@ route[HANDLE_OPTIONS]
     }
 }
 
+route[HANDLE_MESSAGE]
+{
+    if (is_method("MESSAGE")) {
+        if (isflagset(FLAG_INTERNALLY_SOURCED)) {
+            route(INTERNAL_TO_EXTERNAL_RELAY);
+        } else {
+            sl_send_reply("202", "delivered to /dev/null");
+        }
+    }
+}
+
 route[HANDLE_MOVE_REQUEST]
 {
     if (is_method("INVITE") && $rU == "*6683*") {
@@ -460,6 +474,11 @@ onreply_route[INTERNAL_REPLY]
     xlog("L_INFO", "$ci|start|recieved internal reply $T_reply_code $rr");
     xlog("L_INFO", "$ci|log|source $si:$sp");
 
+    if (t_check_status("180|183")) {
+        xlog("L_INFO", "$ci|log|session progress, only listening for redirects");
+        setflag(FLAG_SESSION_PROGRESS);
+    }
+
     if ($rs < 300) {
         xlog("L_INFO", "$ci|pass|$T_req($si):$T_req($sp)");
     }
@@ -472,6 +491,7 @@ onreply_route[INTERNAL_REPLY]
 
 }
 
+
 failure_route[INTERNAL_FAULT] 
 {
     # this branch handles failures (>=300) to our media servers,
@@ -500,6 +520,12 @@ failure_route[INTERNAL_FAULT]
 
             remove_hf("X-Redirect-Server");
         }
+    } 
+    
+    if (isflagset(FLAG_SESSION_PROGRESS)) {
+        xlog("L_INFO", "$ci|log|failure route ignoring failure after session progress");
+        
+        exit;
     } else if (t_check_status("(401)|(407)|(486)")) {
         xlog("L_INFO", "$ci|log|failure route ignoring auth reply $T_reply_code $rr");