# FACCH - Fast Associated Control Channel #### Fast Associated Control Channel (FACCH) The Fast Associated Control Channel (FACCH) is a channel utilized in GSM networks to send urgent signaling information. It temporarily takes over voice traffic channels to ensure that critical control messages are transmitted with minimal delay. FACCH is particularly useful during call setup, handovers, and call release to ensure smooth operation and maintain connection quality without a noticeable impact on voice call continuity. --- # 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/gsm-channels/signalling-channels/dedicated-channels/point-to-point-signalling/facch-fast-associated-control-channel.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.