Universal Trace Analyzer
Error codes › EMM cause (LTE NAS)

EMM cause #39 CS service temporarily not available

EMM cause (LTE NAS)3GPP TS 24.301 §9.9.3.9 and Annex A

What it means

CS service temporarily not available: CS fallback can't be served right now.

Where you see it

In LTE NAS Attach reject, Tracking area update reject, Service reject or Detach request.

What to check

Look at the S6a (MME↔HSS) and S11 messages just before the reject: they usually show the real trigger.

Got a trace with EMM cause #39 CS service temporarily not available? Drop it in the analyzer: it finds the step that really failed first, which node sent the code and what to ask the other side. Captures, test-system PDFs and vendor exports. 5 free analyses a month, no sign-up.

Analyze a trace free

Related codes

EMM cause #40 No EPS bearer context activatedNo EPS bearer context activated: the network has no active bearer for …EMM cause #42 Severe network failureSevere network failure: the network has a lasting problem and the phon…EMM cause #26 Non-EPS authentication unacceptableNon-EPS authentication unacceptable: sent by the phone when the authen…EMM cause #25 Not authorized for this CSGNot authorized for this CSG: the subscriber isn't allowed in this clos…EMM cause #24 Security mode rejected, unspecifiedSecurity mode rejected, unspecified: the phone rejected the Security M…EMM cause #23 UE security capabilities mismatchUE security capabilities mismatch: the security capabilities echoed ba…