To retrieve items with informations about Jingle call from collection item-type
attribute needs to be added to <retrieve/>
element from section 7.2 Retrieving a Collection of XEP-0136 specification with value set to call
.
A result will be returned as specified in XEP-0136, but instead of <chat/>
element <events/>
element will be returned.
Moreover instead of message subelements in <from/>
and <to/>
elements, there will be custom element containing information about call, ie. Jingle session ID - <sid/>
.