• Delete Session Request

• Create Bearer Response

• Update Bearer Response

• IE is sent in delete session request to denote the internal/UE/Diameter cause, which will result in session termination.

• IE is sent in Create Bearer Response to denote the internal cause due to which the “request bearer creation” have to be rejected. As ePDG does not interact with UE/AAA for create bearer request it will send internal cause codes.

• IE is sent in Update Bearer Response to denote the internal cause due to which the “request bearer update” have been rejected. As ePDG does not interact with UE/AAA for update bearer request, so ePDG will send internal cause codes.

• New CLI is introduced under call-control profile which enables/disables sending of RAN/NAS Cause IE and internal failure causes.

• eGTPC rejected requests do not have RAN/NAS Cause IE stack.

• If Notify Payload is not received as part of Delete request from UE, internal failure cause would be sent in RAN/NAS cause IE.

config 
           call-control-profile  profile_name 
             epdg-s2b-gtpv2 send ran-nas-cause internal-failure protocol-type 8    
             [remove] epdg-s2b-gtpv2 send ran-nas-cause internal-failure   
          exit  
       exit 

• Sending RAN NAS CAUSE

• Sending RAN NAS CAUSE Internal Failures

• RAN NAS CAUSE Internal Failures Protocol Type