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       This  document describes the cause messages, used with the
       ISDN D-channel protocols EDSS1 and 1TR6 and their  format,
       visible to the user.


       Cause messages are 2-byte information elements, describing
       the state transitions of an ISDN line. Each cause  message
       describes  its  origination  (location) in one byte, while
       the cause code is described in the other byte. Internally,
       when  EDSS1  is used, the first byte contains the location
       while the second byte contains the cause code. When  using
       1TR6,  the  first  byte  contains the cause code while the
       location is coded in the second byte. In  the  Linux  ISDN
       subsystem, the cause messages visible to the user are uni­
       fied to avoid confusion. All user visible  cause  messages
       are displayed as hexadecimal strings. These strings always
       have the location coded in the first byte,  regardless  if
       using  1TR6  or EDSS1. When using EDSS1, these strings are
       preceeded by the character 'E'.


       The following location codes are defined when using EDSS1:

       00     Message generated by user.

       01     Message  generated  by  private network serving the
              local user.

       02     Message generated by  public  network  serving  the
              local user.

       03     Message generated by transit network.

       04     Message  generated  by  public  network serving the
              remote user.

       05     Message generated by private  network  serving  the
              remote user.

       07     Message generated by international network.

       0A     Message  generated  by network beyond inter-working

       The following cause codes are defined when using EDSS1:

       01     Unallocated (unassigned) number.

       02     No route to specified transit network.
       13     No answer from user (user alerted).

       15     Call rejected.

       16     Number changed.

       1A     Non-selected user clearing.

       1B     Destination out of order.

       1C     Invalid number format.

       1D     Facility rejected.

       1E     Response to status enquiry.

       1F     Normal, unspecified.

       22     No circuit or channel available.

       26     Network out of order.

       29     Temporary failure.

       2A     Switching equipment congestion.

       2B     Access information discarded.

       2C     Requested circuit or channel not available.

       2F     Resources unavailable, unspecified.

       31     Quality of service unavailable.

       32     Requested facility not subscribed.

       39     Bearer capability not authorised.

       3A     Bearer capability not presently available.

       3F     Service or option not available, unspecified.

       41     Bearer capability not implemented.

       42     Channel type not implemented.

       45     Requested facility not implemented.

       46     Only restricted digital information bearer.

       4F     Service or option not implemented, unspecified.

       5B     Invalid transit network selection.

       5F     Invalid message, unspecified.

       60     Mandatory information element is missing.

       61     Message type non-existent or not implemented.

       62     Message not compatible with call state  or  message
              or message type non existent or not implemented.

       63     Information  element  non-existent  or  not  imple­

       64     Invalid information element content.

       65     Message not compatible.

       66     Recovery on timer expiry.

       6F     Protocol error, unspecified.

       7F     Inter working, unspecified.


       The following location codes are defined when using 1TR6:

       00     Octet not available. (Not always generated.)

       44     Message generated by public network.

       45     Message generated by private network.

       4F     Unknown.

       The following cause codes are defined when using 1TR6:

       00     Normal call clearing.

       01     Invalid Call reference value.

       03     Bearer service not implemented.

       07     Call identity does not exist.

       08     No channel available.

       10     Requested facility not implemented.

       38     Number changed.

       3A     No user responding.

       3B     User busy.

       3D     Incoming calls barred.

       3E     Call rejected.

       59     Network congestion.

       5A     Remote user initiated.

       70     Local procedure error.

       71     Remote procedure error.

       72     Remote user suspended.

       73     Remote user resumed.

       7F     User info discarded locally.


       ITU Q.850, FTZ Richtlinien 1TR3, Band 3 (1TR6)

ISDN 4 Linux 3.3            1998/12/02              isdn_cause(7)

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