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Outgoing Call Blocking using ACR feature of the DVG ATA in some cases instead of NCOS.
Primus provides, upon request, the Network Class of Service (NCOS) feature to block outgoing calls. NCOS has multiple call blocking options, including 411, 900, LongDistance, US LD only, Overseas, etc.
Call TBB Customer Support if you would like to add this to your account.