diff --git a/CHANGES b/CHANGES
index b5ec08d..a8ddcf5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,7 @@ CHANGES
 HEAD
 ------------------
 - refuse to reload on active channels
+- ast_devstate_changed() changes with new cache argument
 
 
 chan_capi-1.1.6
diff --git a/chan_capi_devstate.c b/chan_capi_devstate.c
index 656c2ab..a794ca9 100644
--- a/chan_capi_devstate.c
+++ b/chan_capi_devstate.c
@@ -113,7 +113,11 @@ void pbx_capi_chat_room_state_event(const char* roomName, int inUse)
 {
 	if (capiChatProviderRegistered != 0) {
 #ifdef CC_AST_HAS_VERSION_1_6
-		ast_devstate_changed((inUse != 0) ? AST_DEVICE_INUSE : AST_DEVICE_NOT_INUSE, "capichat:%s", roomName);
+		ast_devstate_changed((inUse != 0) ? AST_DEVICE_INUSE : AST_DEVICE_NOT_INUSE,
+#ifdef CC_AST_HAS_AST_DEVSTATE_CACHE
+			AST_DEVSTATE_CACHABLE,
+#endif
+			"capichat:%s", roomName);
 #else
 		ast_device_state_changed("capichat:%s", roomName);
 #endif
@@ -130,7 +134,11 @@ void pbx_capi_ifc_state_event(const struct cc_capi_controller* capiController, i
 			((capiController->nfreebchannels >= capiController->nfreebchannelsHardThr) &&
 				(capiController->nfreebchannels - channelsChanged < capiController->nfreebchannelsHardThr))) {
 #ifdef CC_AST_HAS_VERSION_1_6
-		ast_devstate_changed(AST_DEVICE_UNKNOWN, CC_MESSAGE_BIGNAME"/I%d/congestion", capiController->controller);
+		ast_devstate_changed(AST_DEVICE_UNKNOWN,
+#ifdef CC_AST_HAS_AST_DEVSTATE_CACHE
+			AST_DEVSTATE_CACHABLE,
+#endif
+			CC_MESSAGE_BIGNAME"/I%d/congestion", capiController->controller);
 #else
 		ast_device_state_changed (CC_MESSAGE_BIGNAME"/I%d/congestion", capiController->controller);
 #endif
diff --git a/create_config.sh b/create_config.sh
index 729f914..8826f4a 100755
--- a/create_config.sh
+++ b/create_config.sh
@@ -221,6 +221,13 @@ check_version_onesix()
 		echo "#undef CC_AST_HAS_AST_DEVSTATE2STR" >>$CONFIGFILE
 		echo " * obsolete devstate2str function"
 	fi
+	if grep -q "ast_devstate_changed.*ast_devstate_cache" $INCLUDEDIR/devicestate.h; then
+		echo "#define CC_AST_HAS_AST_DEVSTATE_CACHE" >>$CONFIGFILE
+		echo " * found ast_devstate_cache in ast_devstate_changed function"
+	else
+		echo "#undef CC_AST_HAS_AST_DEVSTATE_CACHE" >>$CONFIGFILE
+		echo " * no ast_devstate_cache in ast_devstate_changed function"
+	fi
 	if grep -q "ast_request.*requestor" $INCLUDEDIR/channel.h; then
 		echo "#define CC_AST_HAS_REQUEST_REQUESTOR" >>$CONFIGFILE
 		echo " * found requestor in ast_request"