There are a several of features missing from the presence implementation on Kamailio. These are not required for all deployments, but are listed here to provide a check-list showing what needs to be done before the presence modules can be considered complete.

===== Presence =====
  * GEOPRIV
  * External references in org.openmobilealliance.pres-rules documents (need to handle org.oma.pres-rules and pres-rules as different document types)
  * Polled presence (out-of-dialog SUBSCRIBE with Expires: 0)
  * Watcher filtering (XML in SUBSCRIBE body describing what parts of a presentity should be notified)
  * Anonymous fetch
  * Capabilities and user discovery
  * Partial notification

===== RLS =====
  * External references in resource-list documents
  * Polled presence (out-of-dialog SUBSCRIBE with Expires: 0)
  * Watcher filtering (XML in SUBSCRIBE body describing what parts of a presentity should be notified)
  * Anonymous fetch
  * Capabilities and user discovery
  * Partial notification

===== XCAP Client =====
  * does not use conditional requests (ETag:, If-Match:, If-Not-Match:)
  * does not support xcap-diff (could be implemented using PUA)

===== XCAP Server =====
  * does not support xcap-diff
  * does not support XQuery
  * does not support many org.openmobilealliance auids