Just an FYI here as I did plan on changing the IM address scheme for our org. to use email address rather than userID@domain so as to make things a bit easier for signing in. However I've made some other recent changes and now I think the IM address scheme change is redundant. My env.: CUCM / IMP 11.0 MRA via Expressway's 8.6 Active Directory with Windows 2012 server SAML SSO with ADFS on Windows 2012 server Because of the SSO implementation for on-premise and MRA, we can sign in using email address such as " firstname.lastname@domain.com "; or we can use the old method " flastname@internal.domain.com " where flastname is really the first initial, then lastname. Because of the @domain.com portion and the @internal.domain.com portion I have multiple SRV records internally and externally for the autodiscovery to work regardless or what login name is entered. I recently heard that autodiscovery is not implemented in later jabber releases so I'm not sure if these are still required. For the SSO Sign in, I ran a powershell command (found from google, because I'm not a MS person but I know how to use google ) which means users can use their email address as their username or their user ID as normal. Once signed in, internal users are found through the LDAP, or are populated automatically through Active Directory groups. I have 3 groups for all users (40 people in the company) and this covers all sites. IM address for internal people is the flastame@internal.domain.com (our internal domain is a sub domain of the external domain). The IM address for internal users is transparent and never actually typed out by anyone. For XMPP federation, external parties can send messages to our email addresses such as firstname.lastname@domain.com . This is done directly to IMP through our firewall (not via Expressways). So to summarise, users can log in using email address and external parties send IM's to our internal users via their email address. The only area where the userID@domain IM address is in use is internally which is benign / transparrent to our users. Hope this helps.
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