> For the complete documentation index, see [llms.txt](https://gsm.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gsm.learn-telecom.com/gsm-channels/signalling-channels/dedicated-channels/point-to-point-signalling/facch-fast-associated-control-channel.md).

# 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.