> 5.4.1 | Troubleshooting

> When the MS realizes the implemented software but the TE does not respond correctly, the following error might occur:

> • | The “Request Test” message is not sent from the TE: No version check takes place. No retransmission for “Request Test“ message is triggered. The multiplexer starts with protocol version 1 because no version information was exchanged between TE and MS.

> However, it is possible to send test commands with “any contents” (except for test messages with the specific IEI for the version check). If a test command with “any contents” is sent, it has to be sent back to the originator with the same contents.