Unable to forward voice frame
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This happens on Zap lines when user dials incorrect number.
Far end sends:
< Message type: PROGRESS (3) < [08 02 84 81] < Cause (len= 4) [ Ext: 1 Coding: CCITT (ITU) standard (0) 0: 0 Location: Public network serving the remote user (4) < Ext: 1 Cause: Unallocated (unassigned) number (1), class = Normal Event (0) ]