try a simple buffer

src/dcall.c

@@ -230,8 +230,8 @@ int main(int argc, char *argv[]) {
     .audio_sink = "pulsesink",
     .audio_tap = "pulsesrc",
     .grtppktlost = 0,
-    .droplat = FALSE,
-    .buffering_mode = "slave"
+    .droplat = TRUE,
+    .buffering_mode = "none"
   };
   int opt = 0;