# Registration messages Registration messages: Reference IMSI DETACH INDICATION 9.2.12 LOCATION UPDATING ACCEPT 9.2.13 LOCATION UPDATING REJECT 9.2.14 LOCATION UPDATING REQUEST 9.2.15 {% embed url="" %} The document referenced appears to be about the GSM technical specifications, focusing on various signaling messages such as IMSI Detach Indication, Location Updating Accept/Reject, and Location Updating Request. For detailed explanations of these messages, please refer to the [ETSI GSM 04.08 document](https://www.etsi.org/deliver/etsi_gts/04/0408/05.00.00_60/gsmts_0408v050000p.pdf). IMSI DETACH INDICATION 9.2.12: This message is sent by a mobile station to notify the network that it is detaching, helping to manage resources effectively. LOCATION UPDATING ACCEPT 9.2.13: This message confirms that the location update request from a mobile station has been successfully processed. LOCATION UPDATING REJECT 9.2.14: This message is sent when a location update request cannot be processed by the network, including a reason code. LOCATION UPDATING REQUEST 9.2.15: This message is sent by a mobile station to update its location in the network. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://gsm.learn-telecom.com/messages-for-mobility-management/registration-messages.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.