Hi Russ,
Unity Broadcast Message Manager lets you use a .wav file to send the Broadcast Message but there are other methods as well depending on your needs.There is a difference here as you nicely noted :) Broadcast Messages do not light MWI's. You can setup a Public Distribution List to accomplish this and Light MWI's;
Unity Broadcast Message Manager
Sending a New Broadcast Message
From this link;
http://ciscounitytools.com/App_BroadcastMessageManager.htm
From Unity Master Jeff Lindborg;
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=Unified%20Communications%20Applications&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1dd8ad43
From Ginger and Chris;
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=Unified%20Communications%20Applications&topicID=.ee835d2&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cd23a39
System Broadcast Messages Overview
Though system broadcast messages may sound similar to regular voice messages, they are not simply voice messages sent to a large distribution list. A system broadcast message is unique in the following ways:
•System broadcast messages are played immediately after subscribers log on to Cisco Unity by phone-even before they hear message counts for new and saved messages. After logging on, subscribers hear how many system broadcast messages they have and Cisco Unity begins playing them.
•For each system broadcast message, the sender specifies how long Cisco Unity will broadcast the message. •Subscribers must listen to each system broadcast message in its entirety before Cisco Unity allows them to hear new and saved messages or to change setup options. Subscribers cannot fast-forward or skip a system broadcast message.
•If a subscriber hangs up before playing the entire system broadcast message, the message plays again the next time that the subscriber logs on to Cisco Unity by phone (assuming that the message is still active).
•When a subscriber has finished playing a system broadcast message, the message can either be replayed or permanently deleted. Subscribers cannot respond to, forward, or save system broadcast messages.
•Subscribers can receive an unlimited number of system broadcast messages.
•Subscribers receive system broadcast messages even when they exceed their mailbox size limits and are no longer able to receive other messages. Because of the way that the messages are stored on the Cisco Unity server, they are not included in the total mailbox size for each subscriber.
•New subscribers hear all active broadcast messages immediately after they enroll as a Cisco Unity subscriber.
•System broadcast messages do not light message waiting indicators (MWIs) on subscriber phones
•Subscribers do not receive system broadcast messages in the Cisco Unity Inbox.
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/administration/guide/ex/5xcusag230e.html
Public Distribution Lists Overview
Public distribution lists are used to send voice messages to multiple subscribers. The subscribers that are assigned to a public distribution list typically are subscribers who need the same information on a regular basis, such as employees in a department or members of a team. The class of service that is associated with each subscriber account dictates whether subscribers can send messages to public distribution lists in Cisco Unity.
Cisco Unity automatically creates a public distribution list called All Subscribers. You may want to associate the All Subscribers list with every subscriber template.
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/administration/guide/ex/5xcusag240e.html#wp1047746
Hope this helps!
Rob
