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6 PRI configuration using single D channel

I need to insert a pair of gateways between a Nortel PBX and the AT&T network jacks.  There are 6 PRIs feeding the PBX configured with a primary D channel on span 1 and a backup D channel on span 2.  The other four spans have all 24 channels set as B channels.

I tried NFAS configuration but cannot get the network to except or take calls from a FXS port on the gateway.  The D channel goes down and up with every call attempt.

I cannot configure NFAS to work with the PBX side.  NFAS will not allow the PRI to be set for network-emulation.

Changing the configuration on the Nortel is not a good option.  I need to match it.


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