freeswitch 1.6.20 has trouble finding params

kamailio/fast-pickup-role.cfg

@@ -81,14 +81,14 @@ route[FAST_PICKUP_ATTEMPT]
               if($du != $null) {
                   if($(kzR{kz.json,Other-Leg-Call-ID}) == "") {
                       ## not bridged
-                      $var(rep) = $_s($hdr(Replaces);a-leg=true);
+                      $var(rep) = $_s($var(replaced_call_id);a-leg=true);
                   } else {
                       ## ensure early-only=true
-                      $var(rep) = $_s($(hdr(Replaces){re.subst,/;early-only//});early-only=true);
+                      $var(rep) = $_s($var(replaced_call_id);early-only=true);
                   }
                   remove_hf_re("^Replaces");
                   append_hf("Replaces: $var(rep)\r\n");
-                  xlog("L_INFO", "$ci|log|call-id $var(replaced_call_id) found redirecting call ($(ru{uri.user})) to $du\n");
+                  xlog("L_INFO", "$ci|log|call-id $var(replaced_call_id) found, redirecting call ($(ru{uri.user})) to $du => $var(rep)\n");
                   route(EXTERNAL_TO_INTERNAL_RELAY);
                   exit();
               } else {