Index: apps/app_confbridge.c
===================================================================
--- apps/app_confbridge.c	(revision 250962)
+++ apps/app_confbridge.c	(working copy)
@@ -463,6 +463,12 @@
 		conference_bridge->markedusers++;
 	}
 
+	/* Set the device state for this conference */
+	if (conference_bridge->users == 1) {
+		ast_devstate_changed(AST_DEVICE_INUSE, "confbridge:%s", conference_bridge->name);
+	}
+
+
 	/* If the caller is a marked user or is waiting for a marked user to enter pass 'em off, otherwise pass them off to do regular joining stuff */
 	if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER | OPTION_WAITMARKED)) {
 		post_join_marked(conference_bridge, conference_bridge_user);
@@ -533,6 +539,9 @@
 			}
 		}
 	} else {
+		/* Set device state to "not in use" */
+		ast_devstate_changed(AST_DEVICE_NOT_INUSE, "confbridge:%s", conference_bridge->name);
+	
 		ao2_unlink(conference_bridges, conference_bridge);
 	}
 
Index: CHANGES
===================================================================
--- CHANGES	(revision 250962)
+++ CHANGES	(working copy)
@@ -140,6 +140,8 @@
    type features.
  * Added new application VMSayName that will play the recorded name of the voicemail
    user if it exists, otherwise will play the mailbox number.
+ * Added custom device states to ConfBridge bridges.  Use 'confbridge:<name>' to
+   retrieve state for a particular bridge, where <name> is the conference name
 
 Dialplan Functions
 ------------------