Nortel BayStack 100-S Install Manual

Also see for 400: Reference Release note Using Setup Quick reference guide

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Nortel BayStack 100-S Install Manual Manual pdf 98 page image

98 Appendix C Troubleshooting and error messages209226-BCommon ISDN cause codesIf there is a problem with your ISDN line, the unit log is displayed and theappropriate ISDN disconnection cause code is recorded at the end of the log.Table 6 describes common ISDN cause codes.Table 6 Common ISDN cause codesCause code Meaning16 Normal call clearing [Q.850] – Indicates that the call is being clearedbecause one of the users involved in the call has requested that the callbe cleared. Under normal situations, the source of this cause is not thenetwork.17 User busy [Q.850] – Indicates that the called party is unable to acceptanother call because the user busy condition has been encountered. Thiscause value may be generated by the called user or by the network. Inthe case of user determined user busy it is noted that the user equipmentis compatible with the call.18 No user responding [Q.850] – Indicates that a called party has notresponded to a call establishment message with either an alerting orconnect indication within the prescribed period of time.19 No answer from user (user alerted) [Q.850] – Indicates that the calledparty has been alerted but does not respond with a connect indicationwithin the prescribed period of time. Note: This cause is not necessarilygenerated by Q.931 procedures but may be generated by internalnetwork timers.21 Call rejected [Q.850] – Indicates that the equipment sending this causecan accept the call (it is neither busy nor incompatible), but will not. Thiscause may also be generated by the network, indicating that the call wascleared due to a supplementary service constraint. The diagnostic fieldmay contain additional information about the supplementary service andreason for rejection.31 Normal, unspecified [Q.850] – Used to report a normal event only whenno other cause in the normal class applies.34 No circuit/channel available [Q.850] – Indicates that there is noappropriate circuit/channel presently available to handle the call.127 Interworking, unspecified [Q.850] – Indicates that an interworking call(usually a call to SW56 service) has ended.145 Data link failure146 TEI or SID (USA) negotiation failure