I believe it is a result of the query Expressway-C makes into CCM. Expressway-C 
queries CCM with the username the user attempted to authenticate with, and CCM 
is looking for that username in the UserID field of the End User account, as 
apposed to looking for the user@host alternate attribute being used as the 
flexible ID that is configured on the IM and Presence server (Ex. Mail ID).

In all fairness, it does work, sort of, after the initial client login is 
performed internally and the client cache is built (because the client will 
have cached the correct UserID for future MRA logins). However, from an 
initial, "clean client" perspective, I don't believe you'd be able to login 
over MRA with the FJID, only the actual User ID.

Thanks,

== Ryan ==

________________________________
From: cisco-voip <cisco-voip-boun...@puck.nether.net> on behalf of Pawlowski, 
Adam <aj...@buffalo.edu>
Sent: Wednesday, May 23, 2018 4:24 PM
To: cisco-voip@puck.nether.net
Subject: Re: [cisco-voip] Moving LDAP Integrated Users across domains

How does Flexible JID not work via MRA?

The domains would just need to be provisioned as separate service domains with 
the correct certificates and DNS records? That's a bit of a pain but it should 
still work?

Adam
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