This fix solves problem with intense squelch noise when someone joins conf in bug 9430; We repro'd the problem with meetme opts of 'CciMo'; Josh Colp supplied this patch, and I'm applying it. It looks like playing the recorded username will louse up the next thing played into the channel. Josh rearranged the code so as to start things over before playing data directly into the conference.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@77191 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -761,38 +761,44 @@ static struct ast_conference *build_conf(char *confno, char *pin, char *pinadmin
 	ast_copy_string(cnf->confno, confno, sizeof(cnf->confno));
 	ast_copy_string(cnf->pin, pin, sizeof(cnf->pin));
 	ast_copy_string(cnf->pinadmin, pinadmin, sizeof(cnf->pinadmin));
+
+	/* Setup a new zap conference */
+	ztc.confno = -1;
+	ztc.confmode = ZT_CONF_CONFANN | ZT_CONF_CONFANNMON;
+	cnf->fd = open("/dev/zap/pseudo", O_RDWR);
+	if (cnf->fd < 0 || ioctl(cnf->fd, ZT_SETCONF, &ztc)) {
+		ast_log(LOG_WARNING, "Unable to open pseudo device\n");
+		if (cnf->fd >= 0)
+			close(cnf->fd);
+		free(cnf);
+		cnf = NULL;
+		goto cnfout;
+	}
+
+	cnf->zapconf = ztc.confno;
+
+	/* Setup a new channel for playback of audio files */
 	cnf->chan = ast_request("zap", AST_FORMAT_SLINEAR, "pseudo", NULL);
 	if (cnf->chan) {
 		ast_set_read_format(cnf->chan, AST_FORMAT_SLINEAR);
 		ast_set_write_format(cnf->chan, AST_FORMAT_SLINEAR);
-		cnf->fd = cnf->chan->fds[0];	/* for use by conf_play() */
-	} else {
-		ast_log(LOG_WARNING, "Unable to open pseudo channel - trying device\n");
-		cnf->fd = open("/dev/zap/pseudo", O_RDWR);
-		if (cnf->fd < 0) {
-			ast_log(LOG_WARNING, "Unable to open pseudo device\n");
+		ztc.chan = 0;
+		ztc.confno = cnf->zapconf;
+		ztc.confmode = ZT_CONF_CONFANN | ZT_CONF_CONFANNMON;
+		if (ioctl(cnf->chan->fds[0], ZT_SETCONF, &ztc)) {
+			ast_log(LOG_WARNING, "Error setting conference\n");
+			if (cnf->chan)
+				ast_hangup(cnf->chan);
+			else
+				close(cnf->fd);
 			free(cnf);
 			cnf = NULL;
 			goto cnfout;
 		}
 	}
-	
-	/* Setup a new zap conference */
-	ztc.confno = -1;
-	ztc.confmode = ZT_CONF_CONFANN | ZT_CONF_CONFANNMON;
-	if (ioctl(cnf->fd, ZT_SETCONF, &ztc)) {
-		ast_log(LOG_WARNING, "Error setting conference\n");
-		if (cnf->chan)
-			ast_hangup(cnf->chan);
-		else
-			close(cnf->fd);
-		free(cnf);
-		cnf = NULL;
-		goto cnfout;
-	}
+
 	/* Fill the conference struct */
 	cnf->start = time(NULL);
-	cnf->zapconf = ztc.confno;
 	cnf->isdynamic = dynamic ? 1 : 0;
 	if (option_verbose > 2)
 		ast_verbose(VERBOSE_PREFIX_3 "Created MeetMe conference %d for conference '%s'\n", cnf->zapconf, cnf->confno);