Index: channels/chan_dahdi.c
===================================================================
--- channels/chan_dahdi.c	(revision 282537)
+++ channels/chan_dahdi.c	(working copy)
@@ -5636,7 +5636,7 @@
 			ast_log(LOG_DEBUG,"Received AST_CONTROL_PROGRESS on %s\n",chan->name);
 #ifdef HAVE_PRI
 			p->digital = 0;	/* Digital-only calls isn't allows any inband progress messages */
-			if (!p->progress && p->sig==SIG_PRI && p->pri && !p->outgoing) {
+			if (!p->progress && !p->alerting && p->sig==SIG_PRI && p->pri && !p->outgoing) {
 				if (p->pri->pri) {		
 					if (!pri_grab(p, p->pri)) {
 						pri_progress(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1);