The MID Server ECC queue The External Communication Channel (ECC) Queue is a connection point between an instance and the MID Server. Jobs that the MID Server needs to perform are saved in this queue until the MID Server is ready to handle them. The MID Server subscribes to messages published by the Asynchronous Message Bus (AMB), which notifies the MID Server that it has pending tasks in the ECC queue. If a job exists in the ECC Queue for that MID Server, the MID Server sets the status to "I'm working on it." When finished working on a requested job, the MID Server reports back to the ECC queue with the results.