Index: asterisk-1.8.27.0/channels/chan_dahdi.c
===================================================================
--- asterisk-1.8.27.0.orig/channels/chan_dahdi.c	2014-05-01 18:42:10.000000000 +0100
+++ asterisk-1.8.27.0/channels/chan_dahdi.c	2014-05-02 11:48:03.000000000 +0100
@@ -2355,7 +2355,7 @@
 {
 	struct dahdi_pvt *p = pvt;
 
-	if (p->waitingfordt.tv_usec) {
+	if (p->waitingfordt.tv_sec) {
 		return 1;
 	}
 
@@ -9246,7 +9246,7 @@
 #if 0
 	ast_debug(1, "Read %d of voice on %s\n", p->subs[idx].f.datalen, ast->name);
 #endif
-	if (p->dialing ||  p->radio || /* Transmitting something */
+	if ((p->dialing && !p->waitingfordt.tv_sec) ||  p->radio || /* Transmitting something */
 		(idx && (ast->_state != AST_STATE_UP)) || /* Three-way or callwait that isn't up */
 		((idx == SUB_CALLWAIT) && !p->subs[SUB_CALLWAIT].inthreeway) /* Inactive and non-confed call-wait */
 		) {