isdn_cause(7)

1isdn_cause(7)                    Miscellaneous                   isdn_cause(7)
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NAME

6       isdn_cause - Description of ISDN cause messages.
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DESCRIPTION

9       This  document describes the cause messages, used with the ISDN D-chan‐
10       nel protocols EDSS1 and 1TR6 and their format, visible to the user.
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FORMAT

13       Cause messages are 2-byte information elements,  describing  the  state
14       transitions  of an ISDN line. Each cause message describes its origina‐
15       tion (location) in one byte, while the cause code is described  in  the
16       other byte. Internally, when EDSS1 is used, the first byte contains the
17       location while the second byte contains  the  cause  code.  When  using
18       1TR6,  the  first  byte  contains  the cause code while the location is
19       coded in the second byte. In the Linux ISDN subsystem, the  cause  mes‐
20       sages visible to the user are unified to avoid confusion. All user vis‐
21       ible cause messages are displayed as hexadecimal strings. These strings
22       always  have  the location coded in the first byte, regardless if using
23       1TR6 or EDSS1. When using EDSS1, these  strings  are  preceded  by  the
24       character 'E'.
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CAUSE MESSAGES WITH EDSS1

27   LOCATION
28       The following location codes are defined when using EDSS1:
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30       00     Message generated by user.
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32       01     Message generated by private network serving the local user.
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34       02     Message generated by public network serving the local user.
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36       03     Message generated by transit network.
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38       04     Message generated by public network serving the remote user.
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40       05     Message generated by private network serving the remote user.
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42       07     Message generated by international network.
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44       0A     Message generated by network beyond inter-working point.
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46   CAUSE
47       The following cause codes are defined when using EDSS1:
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49       01     Unallocated (unassigned) number.
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51       02     No route to specified transit network.
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53       03     No route to destination.
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55       06     Channel unacceptable.
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57       07     Call awarded and being delivered in an established channel.
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59       10     Normal call clearing.
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61       11     User busy.
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63       12     No user responding.
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65       13     No answer from user (user alerted).
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67       15     Call rejected.
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69       16     Number changed.
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71       1A     Non-selected user clearing.
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73       1B     Destination out of order.
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75       1C     Invalid number format.
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77       1D     Facility rejected.
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79       1E     Response to status enquiry.
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81       1F     Normal, unspecified.
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83       22     No circuit or channel available.
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85       26     Network out of order.
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87       29     Temporary failure.
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89       2A     Switching equipment congestion.
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91       2B     Access information discarded.
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93       2C     Requested circuit or channel not available.
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95       2F     Resources unavailable, unspecified.
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97       31     Quality of service unavailable.
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99       32     Requested facility not subscribed.
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101       39     Bearer capability not authorised.
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103       3A     Bearer capability not presently available.
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105       3F     Service or option not available, unspecified.
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107       41     Bearer capability not implemented.
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109       42     Channel type not implemented.
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111       45     Requested facility not implemented.
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113       46     Only restricted digital information bearer.
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115       4F     Service or option not implemented, unspecified.
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117       51     Invalid call reference value.
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119       52     Identified channel does not exist.
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121       53     A suspended call exists, but this call identity does not.
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123       54     Call identity in use.
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125       55     No call suspended.
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127       56     Call having the requested call identity.
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129       58     Incompatible destination.
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131       5B     Invalid transit network selection.
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133       5F     Invalid message, unspecified.
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135       60     Mandatory information element is missing.
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137       61     Message type non-existent or not implemented.
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139       62     Message  not  compatible  with  call state or message or message
140              type non existent or not implemented.
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142       63     Information element non-existent or not implemented.
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144       64     Invalid information element content.
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146       65     Message not compatible.
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148       66     Recovery on timer expiry.
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150       6F     Protocol error, unspecified.
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152       7F     Inter working, unspecified.
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CAUSE MESSAGES WITH 1TR6

155   LOCATION
156       The following location codes are defined when using 1TR6:
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158       00     Octet not available. (Not always generated.)
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160       44     Message generated by public network.
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162       45     Message generated by private network.
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164       4F     Unknown.
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166   CAUSE
167       The following cause codes are defined when using 1TR6:
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169       00     Normal call clearing.
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171       01     Invalid Call reference value.
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173       03     Bearer service not implemented.
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175       07     Call identity does not exist.
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177       08     No channel available.
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179       10     Requested facility not implemented.
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181       11     Requested facility not subscribed.
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183       20     Outgoing calls barred.
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185       21     User access busy.
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187       22     Closed user group mismatch.
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189       23     Non existent closed user group.
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191       25     SPV connection not allowed.
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193       35     Destination not obtainable.
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195       38     Number changed.
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197       3A     No user responding.
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199       3B     User busy.
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201       3D     Incoming calls barred.
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203       3E     Call rejected.
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205       59     Network congestion.
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207       5A     Remote user initiated.
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209       70     Local procedure error.
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211       71     Remote procedure error.
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213       72     Remote user suspended.
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215       73     Remote user resumed.
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217       7F     User info discarded locally.
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NAME

DESCRIPTION

FORMAT

CAUSE MESSAGES WITH EDSS1

CAUSE MESSAGES WITH 1TR6

SEE ALSO