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Can someone please explain the how emergency attach will work ? (call flow)

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Can someone please explain the how emergency attach will work ? (call flow)
posted May 12, 2017 by Dheerendra

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1 Answer

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Best answer

For LTE emergency call if authentication gets failed still network serves the UE based on IMEI. If UE does not have IMSI, IMEI will be used to identify the UE and if IMSI is there but it is unauthenticated network stores unauthenticated IMSI and provide emergency services to UE.

LTE emergency call flow is as same as LTE normal attach w.r.t to messages exchange point of view, here is the call flow -
Emergency Attach

Reference:
http://wired-n-wireless.blogspot.in/2012/04/ims-emergency-calls-over-lte-short.html

answer May 14, 2017 by Harshita
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