Protocol Error Unspecified 111 Reason
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CLASS Cause 1 Unallocated (unassigned) number - This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated (assigned). Cause 2 No route
Isdn Disconnect Cause Codes
to specified transit network - This cause indicates that the equipment sending this cause has ss7 release cause codes received a request to route the call through a particular transit network which it does not recognize. The equipment sending this cause
Normal Unspecified
does not recognize the transit network either because the transit network does not exist or because that particular transit network, while it does exist, does not serve the equipment that is sending this cause. This cause is normal unspecified what is the problem supported on a network dependent basis. Cause 3 No route to destination - This cause indicates that the called party cannot be reached because the network through which the call has been routed does not serve the destination desired. This cause is supported on a network-dependent basis. Cause 4 Send special information tone - This cause indicates that the called party cannot be reached for reasons that are of long term nature and that cause 127 interworking unspecified the special information tone should be returned to the calling party. Cause 5 Misdialed trunk prefix - No procedures specified for US networks. Cause 8 Preemption - This cause indicates that the call is being preempted. Cause 9 Preemption - Circuit reserved for reuse. This cause indicates that the call is being preempted and the circuit is reserved for reuse by the preempting exchange. Cause 16 Normal call clearing - This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared. Under normal situations, the source of this cause is not the network. Cause 17 User busy - This cause is used to indicate that the called party is unable to accept another call because the user busy condition has been encountered. This cause value may be generated by the called user or by the network. In the case of user determined user busy, it is noted that the user equipment is compatible with the call. Cause 18 No user responding - This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated. Cause 19 No answer from user (user alerted) - This value is used when
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Wiki Network Create a new issue Commits Closed Open Issue #8 opened 2015-08-23 12:38:12 UTC by Csaba Sipos@csaba.sipos MAC failure (EMM status #111, protocol error unspecified) https://gitlab.eurecom.fr/oai/openair-cn/issues/8 Failure occures during the calculation of the MAC (Message Authentication Code), while processing an integrity protected message coming from the eNodeb. It seems there are multipe reasons behind this. The following contains all the information we know so far, and will be updated in the feature. 1. Findings by Shaun Ying: The UE remembers its previous context and sends a Identity Response message cause code with a MAC value that is integrity protected. However, since OAI EPC is freshly started and it does not remember the previous security context for the same UE, it expects messages without integrity protection during the attach procedure. Since OAI EPC always compares the MAC values, we see the MAC failure error as quoted above. The quick fix is to compare MAC values only protocol error unspecified when EPC's own MAC is not 0. You may change Line 317 in openair-cn/NAS/COMMON/API/NETWORK/nas_message.c from: if (mac != header->message_authentication_code) { to if ((mac != 0) && (mac != header->message_authentication_code)) { 2. Findings by David Rupprecht: I think I found the encoding error for the s1ap layer. openair-cn/NAS/MME/EMM/SAP/emm_as.c at line 1556 need to be changed to ...= htons(0x10000 >> emm_security_context->selected_ ....); Then the AS layer uses the same algorithms than the NAS layer, which should not be that way. And there is still a forced selection in rrc_eNB_S1AP.c line 235, that EEA0 is used for AS encryption. That is also the reason, why the error was just occurring for the integrity algorithm. The patch is attached. Altough both of the above patches are improving the situation, they are not solving this issue completely. For exmaple with the two patches applied, the Attach procudure is now successfully happens, the MAC failures can still occur eg. during a Detach procedure (or during other NAS realted signalling). Failure occures during the calculation of the MAC (Message Authentication Code), while processing an integrity protected message coming from the eNodeb. It seems there are multipe reasons behind this. T