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Under the DIAL PLAN there is NETWORK TERM and USER TERM (terminating to the Telco Network, or terminating to user equipment). Your PRI should be configured in the NETWORK TERM by selecting the Slot and Port the PRI is plugging into. There is an IFCE CONFIG (interface configuration), and under that is the Switch Type. The ATLAS defaults to National ISDN (NI-2). This is the "signal" they are asking for.
Hope this answers your question,
Thanks Patrick, found it!
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