Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 103555)
+++ channels/chan_sip.c	(working copy)
@@ -3064,6 +3064,21 @@
 			ast_log(LOG_DEBUG, "This call did not properly clean up call limits. Call ID %s\n", p->callid);
 	}
 
+	/* Unlink us from the owner if we have one */
+	if (p->owner) {
+		if (lockowner)
+			ast_channel_lock(p->owner);
+		if (option_debug)
+			ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
+		p->owner->tech_pvt = NULL;
+		/* Make sure that the channel knows its backend is going away */
+		p->owner->_softhangup |= AST_SOFTHANGUP_DEV;
+		if (lockowner)
+			ast_channel_unlock(p->owner);
+		/* Give the channel a chance to react before deallocation */
+		usleep(1);
+	}
+
 	/* Remove link from peer to subscription of MWI */
 	if (p->relatedpeer && p->relatedpeer->mwipvt)
 		p->relatedpeer->mwipvt = NULL;
@@ -3098,16 +3113,6 @@
 		ASTOBJ_UNREF(p->registry, sip_registry_destroy);
 	}
 
-	/* Unlink us from the owner if we have one */
-	if (p->owner) {
-		if (lockowner)
-			ast_channel_lock(p->owner);
-		if (option_debug)
-			ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
-		p->owner->tech_pvt = NULL;
-		if (lockowner)
-			ast_channel_unlock(p->owner);
-	}
 	/* Clear history */
 	if (p->history) {
 		struct sip_history *hist;