PBX INVITE TIMER

-  Increased the INVITE TIMER by two once we see a SIP 100 Message. This will give the endpoint more time to respond to the invite and it will trigger the secondary server if it doesn't answer - Fixes #195

kamailio/kamailio51_dsiprouter.cfg

@@ -1746,6 +1746,21 @@ onreply_route[MANAGE_REPLY] {
             route(NATMANAGE);
         }
     }
+
+    if (status=="100" && allow_source_address(FLT_PBX)) {
+
+	# Increase the lifetime of the current INVITE by two times the pbx_invite_timeout
+        # if the PBX returns 100 trying or 180 ringing.  This means that the PBX is at least trying to
+        # establish the call.  So, we will extend the timeout by two.
+
+        $var(pbx_invite_timeout) = (int)$sel(cfg_get.server.pbx_invite_timeout);
+	t_set_max_lifetime($var(pbx_invite_timeout)*2, 0);
+        xlog("L_DBG","[MANAGE_REPLY"]: ***Increasing timeout by 2***");
+	
+
+    }
+    
+
 }
 
 # Manage failure routing cases