-- generic errors 34 systemFailure
35 dataMissing
36 unexpectedDataValue
21 facilityNotSupported
28 incompatibleTerminal
51 resourceLimitation
-- identification and numbering errors 01 unknownSubscriber
144 numberChanged
03 unknownMSC
05 unidentifiedSubscriber
07 unknownEquipment
-- subscription errors 08 roamingNotAllowed
09 illegalSubscriber
12 illegalEquipment
10 bearerServiceNotProvisioned
11 teleserviceNotProvisioned
-- handover errors 25 noHandoverNumberAvailable
26 subsequentHandoverFailure
42 targetCellOutsideGroupCallArea
-- operation and maintenance errors 40 tracingBufferFull
-- call handling errors 39 noRoamingNumberAvailable
27 absentSubscriber
45 busySubscriber
46 noSubscriberReply
13 callBarred
14 forwardingViolation
47 forwardingFailed
15 cug-Reject
48 or-NotAllowed
-- any time interrogation errors 49 ati-NotAllowed
-- any time information handling errors 60 atsi-NotAllowed
61 atm-NotAllowed
62 informationNotAvailable
-- supplementary service errors 16 illegalSS-Operation
17 ss-ErrorStatus
18 ss-NotAvailable
19 ss-SubscriptionViolation
20 ss-Incompatibility
71 unknownAlphabet
72 ussd-Busy
37 pw-RegistrationFailure
38 negativePW-Check
43 numberOfPW-AttemptsViolation
29 shortTermDenial
30 longTermDenial
-- short message service errors 31 subscriberBusyForMT-SMS
32 sm-DeliveryFailure
33 messageWaitingListFull
06 absentSubscriberSM
-- Group Call errors 50 noGroupCallNumberAvailable
22 ongoingGroupCall
-- location service errors 52 unauthorizedRequestingNetwork
53 unauthorizedLCSClient
54 positionMethodFailure
58 unknownOrUnreachableLCSClient
59 mm-EventNotSupported
what is meant by error code 03, Unknown MSC