Feature #59: Support for Lync 2013 Persistent Chats
Lync 2013 Persistent Chats are the same as OCS2007R2 Group Chats, i.e.
they are based on the [MS-XCCOSIP] specification. But in OCS2007R2 the
chat pool URI was hard-coded to ocschat@<domain>, whereas in Lync 2013
you can have one or more chat pools.
- subscriptions: add "persistentChatConfiguration"
- notify: extract default persistent chat pool URI
- groupchat: update initialization to use provisioned URI
Supporting multiple chat pool URIs will require more changes.