Error 3100 may be caused if the database is updated, but the network is not
updated.
Error 3100 occurs in the following cases:
- The data of an undefined subscriber is added.
- Subscriber data is deleted.
- The CancelLocation message is not responded within the specified time, the
message resend function is enabled on the HLR, and error 3100 is generated at the

same time.

The failure that the CancelLocation message is not responded may be caused by the
fact that the HLR fails to send the message or that the MSC fails to send a response.
Two subscribers are selected from the subscribers for whom error 3100 is repeatedly
generated from July 25th to September. The messages of the two subscribers are
traced. The traced messages of the two subscribers show that the MSC responds
with the mp unidentified sub error. It indicates that the MSC does not store the data
of the subscribers. The subscription data, however, is normal on the HLR. Because
error 3100 is generated for a large number of subscribers, another 11 subscribers
are selected for the message tracing. Analyses show that the MSC does not store or
purge the data of the 11 subscribers. In the previous MSC cutover, the dynamic data
of purged subscribers is not copied to the new MSC, and 420 thousand out of the 1.2
million subscribers are in Purged state. Therefore, the fault is resulted from the
cutover.
%%LST DYNSUB: IMSI="XXXXXXXXXXXXX";%%
SUCCESS0001:Operation is successful
IMSI = XXXXXXXXXXXXXXXX
ISDN = YYYYYYYYYYYYY
"Dynamic Status Information For GSM"
VlrNum = ZZZZZZZZZZZZ

MscNum = ZZZZZZZZZZZ

MsPurgedForNonGprs = FALSE
VLRInHplmn = TRUE
VLRInHomeCountry = TRUE
RequireCheckSS = FALSE
RoamingRestrictInMscDueToUnsupportedFeature
= FALSE
MscOrVlrAreaRoamingRestrict
= FALSE
ODBarredForUnsupportedCamel
= FALSE
SupportedCamelPhase1 = FALSE
SupportedCamelPhase2 = FALSE
SupportedCamelPhase3 = FALSE
SRIMsrnCfActive = TRUE
ZoneCodeStatusAtMsc = zoneCodesSupported
ECATEGORYAtMsc = FALSE

After the subscribers switch off and then on their MSs, a location update is
performed, and the error is not generated.

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useful document, thanks