In Domibus, C2 and C3 are shorthands that typically refer to Access Point 2 (AP2) and Access Point 3 (AP3), respectively. Access Points are the endpoints representing the parties involved in a message exchange using the eDelivery AS4 protocol.

  • C2 (Access Point 2): Usually refers to the Access Point that initiates the message exchange (the sender).
  • C3 (Access Point 3): Usually refers to another participant in the message exchange, either the sender or the receiver, depending on the specific message.

If your Domibus setup involves more than two Access Points, you can identify which one is the sender or receiver for a given message by looking at the MSH_ROLE (either SENDING or RECEIVING) and the specific Access Point ID in the TB_MESSAGE_LOG table.