Index: apps/app_meetme.c
===================================================================
--- apps/app_meetme.c	(revision 156687)
+++ apps/app_meetme.c	(working copy)
@@ -169,7 +169,8 @@
 
 enum {
 	OPT_ARG_WAITMARKED = 0,
-	OPT_ARG_ARRAY_SIZE = 1,
+	OPT_ARG_OPTIMIZETALKER = 1,
+	OPT_ARG_ARRAY_SIZE = 2,
 };
 
 AST_APP_OPTIONS(meetme_opts, BEGIN_OPTIONS
@@ -186,7 +187,7 @@
 	AST_APP_OPTION('I', CONFFLAG_INTROUSERNOREVIEW ),
 	AST_APP_OPTION('M', CONFFLAG_MOH ),
 	AST_APP_OPTION('m', CONFFLAG_STARTMUTED ),
-	AST_APP_OPTION('o', CONFFLAG_OPTIMIZETALKER ),
+	AST_APP_OPTION_ARG('o', CONFFLAG_OPTIMIZETALKER, OPT_ARG_OPTIMIZETALKER ),
 	AST_APP_OPTION('P', CONFFLAG_ALWAYSPROMPT ),
 	AST_APP_OPTION('p', CONFFLAG_POUNDEXIT ),
 	AST_APP_OPTION('q', CONFFLAG_QUIET ),
@@ -238,11 +239,12 @@
 "      'l' -- set listen only mode (Listen only, no talking)\n"
 "      'm' -- set initially muted\n"
 "      'M' -- enable music on hold when the conference has a single caller\n"
-"      'o' -- set talker optimization - treats talkers who aren't speaking as\n"
-"             being muted, meaning (a) No encode is done on transmission and\n"
-"             (b) Received audio that is not registered as talking is omitted\n"
-"             causing no buildup in background noise.  Note that this option\n"
-"             will be removed in 1.6 and enabled by default.\n"
+"      'o[(<thresh>)]' -- set talker optimization - treats talkers who aren't\n"
+"             speaking as being muted, meaning (a) No encode is done on\n"
+"             transmission and (b) Received audio that is not registered as\n"
+"             talking is omitted causing no buildup in background noise.  Note\n"
+"             that this option will be removed in 1.6 and enabled by default.\n"
+"             The default threshold is 512.\n"
 "      'p' -- allow user to exit the conference by pressing '#'\n"
 "      'P' -- always prompt for the pin even if it is specified\n"
 "      'q' -- quiet mode (don't play enter/leave sounds)\n"
@@ -1523,7 +1525,7 @@
 	struct dahdi_bufferinfo bi;
 	char __buf[CONF_SIZE + AST_FRIENDLY_OFFSET];
 	char *buf = __buf + AST_FRIENDLY_OFFSET;
-	int setusercount = 0;
+	int setusercount = 0, threshold;
 
 	if (!(user = ast_calloc(1, sizeof(*user))))
 		return ret;
@@ -1878,6 +1880,9 @@
 			ast_log(LOG_WARNING, "Unable to allocate DSP!\n");
 			res = -1;
 		}
+		if ((confflags & CONFFLAG_OPTIMIZETALKER) && !ast_strlen_zero(optargs[OPT_ARG_OPTIMIZETALKER]) && sscanf(optargs[OPT_ARG_OPTIMIZETALKER], "%d", &threshold) == 1) {
+			ast_dsp_set_threshold(dsp, threshold);
+		}
 		for(;;) {
 			int menu_was_active = 0;