When Module for AS4 plays the role of initiating MSH, the Two-Way/Sync transfer is initiated by the wm.ip.estd.as4.msh:submit service.

The parameters specified in the requestUM leg of the TPA are used to generate the user message and identify the address of the responding MSH. After the module receives a reply, it uses the replyUM leg of the TPA to process the user message.

If the module does not receive a response within the time-period defined in as4.twowaysync.requestTimeOut property in the AS4 configuration file, an error message is generated by the initiating MSH. For more information, see Configuring AS4 Configuration Properties.

For more information about configuring the module to use the Two-Way/Sync MEP, see Configuring Trading Partner Agreements. For more information about built-in service, see Built-In Services.