CSFB - Circuit Switched Fallback

A mechanism introduced to allow subscribers on a 4G network to make and receive voice calls. In essence, when a Mobile Originated / Terminated call needs to take place, the subscriber will leave the 4G network and fall back to the 2G/3G network in order to make or receive the call.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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