| without checking I'd guess that the 5 is the location field and 0x12 the cause
,/*0*/"user"
,/*1*/"local private network"
,/*2*/"local public network"
,/*3*/"transit network"
,/*4*/"remote public network"
,/*5*/"remote private network"
,/*6*/Illegal
,/*7*/"international network"
,/*8*/Illegal
,/*9*/Illegal
,/*A*/"network beyond internetworking point"
,0x01,"Unallocated number"
,0x02,"No route to specified transmit network"
,0x03,"No route to destination"
,0x06,"Channel unacceptable"
,0x07,"Call awarded - dleivered in established channel"
,0x10,"Normal call clearing"
,0x11,"User busy"
,0x12,"No user responding"
,0x13,"No answer"
,0x15,"Call rejected"
,0x16,"Number changed"
,0x1A,"Non selected user clearing"
,0x1B,"Destination out of order"
,0x1C,"Invalid number format"
,0x1D,"Facility rejected"
,0x1E,"response to status enquiry"
,0x1F,"Unspecified"
,0x22,"No circuit available"
,0x26,"Network out of order"
,0x29,"Temporary failure"
,0x2A,"Switching equipment congestion"
,0x2B,"Access information discarded"
,0x2C,"Requested circuit unavailable"
,0x2F,"Unspecified"
,0x31,"QoS unavailable"
,0x32,"Facility not subscribed"
,0x39,"Bearer capability not authorized"
,0x3A,"Bearer capability not available"
,0x3F,"Unspecified"
,0x41,"Bearer capability not implemented"
,0x42,"Channel type not implemented"
,0x45,"Facility not implemented"
,0x46,"Only restricted digital available"
,0x4F,"Unspecified"
,0x51,"Invalid call reference"
,0x52,"Identified channel does not exist"
,0x53,"Suspended Call - invalid identity"
,0x54,"Call identity in use"
,0x55,"No call suspended"
,0x56,"Call already cleared"
,0x58,"Incompatible destination"
,0x5B,"Invalid transit network selection"
,0x5F,"Unspecified"
,0x60,"Mandatory ie missing"
,0x61,"Message type not implemented"
,0x62,"Message type not consistent"
,0x63,"ie not implemented"
,0x64,"ie contents invalid"
,0x65,"Message not compatible with state"
,0x66,"Recovery on timer expiry"
,0x6F,"Unspecified"
,0x7F,"Unspecified"
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