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.