To have the Jabber client use your credentials in logging into Phone Accounts, go to User Management -- User Settings -- Service Profile Configuration.
Under Voicemail Profile, there is a section for "Credentials source for Voicemail service". Select "Unified CM - IM & Presence". Save, then restart your client. That should fix it.
This works for Jabber & CUCI-Lync, as far as I know. I've tested it on CUCI Lync 11.6 and Jabber 11.x
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