one more tweak

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7436 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_conference/mod_conference.c

@@ -4488,7 +4488,10 @@ static conference_obj_t *conference_new(char *name, conf_xml_cfg_t cfg, switch_m
 		}
 
 		if (!strcasecmp(var, "rate") && !switch_strlen_zero(val)) {
-			rate_name = val;
+            uint32_t tmp = atoi(val);
+            if (tmp == 8000 || tmp == 16000 || tmp == 32000) {
+                rate_name = val;
+            }
 		} else if (!strcasecmp(var, "domain") && !switch_strlen_zero(val)) {
 			domain = val;
 		} else if (!strcasecmp(var, "interval") && !switch_strlen_zero(val)) {