3.2.5.7 Publication of mwi Category
The unified messaging server notifies the messaging server whenever the voice mail information changes for the user.<34> The unified messaging server also notifies the messaging server every 12 hours even if voice mail information is not changed for the user. When there is a notification from exchange unified messaging server for the user, the messaging server MUST extract the voice mail information from the notify and publish mwi category for that user using the format specified in section 2.2.2.7.11.