diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index 02f643456b16..0ac67bff303a 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -927,10 +927,6 @@ conf_software:
 
 	/* for more than two members.. */
 
-	/* in case of hdlc, we change to software */
-	if (dsp->hdlc)
-		goto conf_software;
-
 	/* if all members already have the same conference */
 	if (all_conf)
 		return;
@@ -941,6 +937,9 @@ conf_software:
 	if (current_conf >= 0) {
 join_members:
 		list_for_each_entry(member, &conf->mlist, list) {
+			/* in case of hdlc, change to software */
+			if (member->dsp->hdlc)
+				goto conf_software;
 			/* join to current conference */
 			if (member->dsp->hfc_conf == current_conf)
 				continue;
diff --git a/drivers/isdn/mISDN/dsp_core.c b/drivers/isdn/mISDN/dsp_core.c
index 7e60cb94b5c0..3083338716b2 100644
--- a/drivers/isdn/mISDN/dsp_core.c
+++ b/drivers/isdn/mISDN/dsp_core.c
@@ -301,8 +301,9 @@ dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
 		if (dsp_debug & DEBUG_DSP_CORE)
 			printk(KERN_DEBUG "%s: start dtmf\n", __func__);
 		if (len == sizeof(int)) {
-			printk(KERN_NOTICE "changing DTMF Threshold "
-				"to %d\n", *((int *)data));
+			if (dsp_debug & DEBUG_DSP_CORE)
+				printk(KERN_NOTICE "changing DTMF Threshold "
+					"to %d\n", *((int *)data));
 			dsp->dtmf.treshold = (*(int *)data) * 10000;
 		}
 		/* init goertzel */