> Looks like we do not even have a jabber-config.xml file on our CUCM servers. > I tried adding in the syntax below ... Adding to where? Are you sure that "unity1" hostname resolved to IP by iPhone? Try to use FCDN or IP address.

Do you understand the difference between new Cisco Jabber and old Jabber Voice?

Carefully read this discussion.

It's a known bug. Colleagues recommend to edit the file jabber-config.xml at CUCM side. https://www.ucguru.com/jabber-configuration-with-jabber-config-xml/ https://supportforums.cisco.com/document/106926/jabber-config-file-generator

Yes, latest Cisco Jabber (v11.1, from App Store) works fine with CUCM v7.1.5, even with video.Without anyone Presence Server.Just disable Auto in Advanced Settings (at first start or after settings reset) and select Phone-Only Mode.At CUCM side devic...