It seems a layer 2 problem, should check about references point (network or 
terminal equipment), it assume your Asterisk box is connected to ISDN PSTN 
provided, just in case check  at you side if all related configuration files 
are configured as signalling=pri_cpe  (Card config, wan_cfg, chan_dahdi.conf), 
PSTN side if network configuration or in service mode, should  both side work 
and debug in the same time.

Mc GRATH Ricardo
E-Mail [email protected]
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