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Cisco Bug: CSCum76163 - Service reject GMM casue 98 causing Service request loop

Last Modified

Feb 04, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(34)

Description (partial)

Symptom:
When SGSN send Service reject with GMM cause 98 ( "Message Type Not compatible with protocol State") some UE didnt understand this and keep sending  Service request and sgsn is sending service reject  and causing loop.

Conditions:
When SGSN send Service reject with GMM cause 98 ( "Message Type Not compatible with protocol State") some UE didnt understand this and keep sending  Service request and sgsn is sending service reject  and causing loop.

As per DE, in-case PTMSI is known and subscriber is in some different state or routing area then yes SGSN can send Service Reject with cause as  "message  type not compatible with protocol state".
For other vendor like NSN , they send 'implicit detach'.
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