ReSIProcate's core transaction processing architecture uses a SIP message-based interface between the Transaction (and lower) layers and the Transaction User layers. The Dialog Usage Manager, which was created to simplify the creation of an user agent, is one example of a Transaction User.
The following diagram (PNG file ) shows the ReSIProcate transaction and transport architecture. Common colors indicate related, thread-connected components. This diagram is also available as PDF  and graffle source . The diagram was created with OmniGraffle Pro 3.0  and updated at the 2005Q2 ReSIProcate documentation session.