LTE: Does the bearer(s)/session(s) get deleted when CS fallback happen for an UE?

Question

What happens for an UE at MME, which gets triggered "UE Context Modifcation Procedure" for "CS fall back" ?

Answer 1

The S1 UE context is being deleted, as to bearers
- for GBR bearers MME initiates Dedicated Bearer Deactivation procedure,
- for non-GBR bearers MME starts the preservation and suspension by sending Suspend Notification message

The CSFB procedure is covered here
http://www.lteandbeyond.com/2013/09/CSFB-Mobile-Terminating-Call-in-Active-mode.html