The vector stencils library "Conversations" contains 11 symbols: communication element, compound conversation element, call conversation (global and collaboration), conversation links, pools. Use these shapes for drawing BPMN 2.0 conversation diagrams using the ConceptDraw PRO diagramming and vector drawing software.
The new Conversation-Model is used to model a "who with whom and what"-view of processes. All process participants can be included in a compact form of modeling as long as denoting which communication is involved.
Process participants are represented as Pools (collapsed...) in Conversation-Models. The Communication-Shape defines a set of logically related message exchanges which are tied to Pools via Conversation-Links. If there is a multi-instanced Pool (also introduced with BPMN 2.0) involved, a Forked Conversation-Link is used for it.
Furthermore Sub-Conversations can be used to define abstractions." [en.bpmn-community.org/tutorials/34/]
The example "Design elements - Conversations (BPMN 2.0)" is included in the Business Process Diagram solution from the Business Processes area of ConceptDraw Solution Park.