CUC 8.5 MWI with Single Inbox Exchange 2010 seems slow and sometimes unreliable

Hi,
I have some issues with MWI for Single Inbox Exchange 2010 + CUC 8.5-HA (latest). When leaving voicemails, sometimes it takes up to 10-20 seconds for Exchange to deliver MWI message. Sometimes it doesn't work at all. CUC mailbox shows that the MWI should be on, but the Exchange Inbox has no unread voicemails. It's either an issue with Exchange not delivering notification (doubt it), or CUC not working.
The message delivery into Exchange works perfectly fine. MWI ON is fast (but that's because CUC turns it on right away). It's EWS syncing back to CUC is very flaky.
Has anyone else had issues and found a good way to troubleshoot it?
On Exch2010 in event viewer I see events like this:
A notification for subscription [HABzdi1hcHBzMDUucmZ0ZWNobm9sb2dpZXMuY29tEAAAAEXPGeSxS3VJiTdeopQts9diaTpYTOXNCA==] against endpoint [http://10.0.16.11:7080/NotificationService/services/NotificationService?id=7682d009-ad26-4644-a323-eb4f198792bd&pid=8104] couldn't be sent. (Send attempts: 2) Details: WebException: The remote server returned an error: (503) Server Unavailable. StatusCode: ServiceUnavailable javax.servlet.ServletException: org.apache.axis2.AxisFault: The system is attempting to engage a module that is not available: addressing    at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at Microsoft.Exchange.Services.Core.NotificationServiceClient.HandleResponse(IAsyncResult responseAsyncResult)
After 5 unsuccessful attempts to send a notification for subscription [HABzdi1hcHBzMDUucmZ0ZWNobm9sb2dpZXMuY29tEAAAAL0DSwmaIBVKo+9/O78sdvlCIvCgS+XNCA==] against endpoint [http://10.0.16.11:7080/NotificationService/services/NotificationService?id=d180f943-1401-4a24-9eb0-19f3b1b5b997&pid=8104], the subscription has been removed. Details: WebException: The remote server returned an error: (503) Server Unavailable. StatusCode: ServiceUnavailable javax.servlet.ServletException: org.apache.axis2.AxisFault: The system is attempting to engage a module that is not available: addressing    at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at Microsoft.Exchange.Services.Core.NotificationServiceClient.HandleResponse(IAsyncResult responseAsyncResult)
This is the full error that I see when going to that link from the web browser on Exchange server:
HTTP ERROR 503
Problem accessing /NotificationService/services/NotificationService. Reason:
    javax.servlet.ServletException: org.apache.axis2.AxisFault: The system is attempting to engage a module that is not available: addressing
Caused by:
javax.servlet.UnavailableException: javax.servlet.ServletException: org.apache.axis2.AxisFault: The system is attempting to engage a module that is not available: addressing
     at org.eclipse.jetty.servlet.ServletHolder.makeUnavailable(ServletHolder.java:394)
     at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:432)
     at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:245)
     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
     at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:694)
     at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:193)
     at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:913)
     at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:584)
     at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:341)
     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
     at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:164)
     at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:161)
     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
     at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:164)
     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
     at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:92)
     at org.eclipse.jetty.server.Server.doStart(Server.java:232)
     at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
     at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:990)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:955)
Powered by Jetty://
Update:
I'm running 8.5.1ES16.11900-16
They are apparently up to ES44 now, TAC will provide me with it, and I'll let you know if it solves the problem.

Hi David,
When you mentioned "I installed the unrestricted version the service responsible for turing off the MWI is not installed.", this service is actually the Connection Notifier service, which exists on all systems. This is the service I was under the impression you were referring to with regards to MWI. Now that you're referring to something else, it changes the situation a bit.
The Connection Jetty and Connection Exchange Notification Web Service both should exist regardless of Restricted/Unrestricted. Something must have happened with your installation if the Connection Exchange Notification Web Service does not exist. If you're in the US, you should be running the Restricted version of the software, so it's still in your best interest to move to the proper version of the software.
Brad

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