In the SIP trunk URI, use either */*/* or Auto/Auto/Auto (depends on the release of your IPO) - make sure outgoing group id is unique for the URI.
Now the ARS will honor the Ns87654321 telephone number. Make sure the telephone number to send matches the format the SIP provider is expecting (in the US, most often PRI circuits want 10 digits, SIP want's 1+10 digits)
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