1.3.1.4.2 User-Initiated on Server
The user can initiate a server-side disconnect by ending the session hosted on the server. To implement this type of disconnection, the server sends the client the following sequence of PDUs:
An optional Set Error Info PDU (containing a detailed reason for the pending disconnection)
An optional Deactivate All PDU
An optional MCS Disconnect Provider Ultimatum PDU (with the reason code set to "user requested")
The connection is then closed by the server.
The sending of the Deactivate All and MCS Disconnect Provider Ultimatum PDUs is specified in section 3.3.5.5.1, while the sending of the Set Error Info PDU is specified in section 3.3.5.7.1.