diff -Nuar oldast/channels/chan_alsa.c asterisk/channels/chan_alsa.c
--- oldast/channels/chan_alsa.c	2003-04-27 20:13:11.000000000 +0200
+++ asterisk/channels/chan_alsa.c	2003-05-23 22:49:57.000000000 +0200
@@ -423,7 +423,7 @@
 	}
 #endif
 
-	err = snd_pcm_sw_params_set_silence_threshold(handle, swparams, buffer_size);
+	err = snd_pcm_sw_params_set_silence_threshold(handle, swparams, silencethreshold);
 	if (err < 0) {
 		ast_log(LOG_ERROR, "Unable to set silence threshold: %s\n", snd_strerror(err));
 	}