We recently upgraded from SBS2003 to SBS2011 & Exchange 2010. Public server name and address are the same. Our Zultys phone system (MX250) was configured to send email notifications of voicemail to certain users. Since the upgrade, users keep getting error messages instead of notifications. When I run a test in the Zultys Admin software I get "connect failed". I did create a receive connector in the Hub transport for the phone system with its internal ip address. Not sure what else to look at--any ideas? On the Zultys end, the server is specified as not requiring authentication. In the properties of the exchange receive connector, there is no authentication specified.