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PPPTSM 83: ISDN address/local phone number is required for bringing up additional link for PPP Multilink. Reconfigure interface interface_name and retry.
Source: PPPTSM-1.1
Explanation: The peer queried the local phone number for calling to add a link for Multilink, but no phone number is configured.
Action: Load NIASCFG to check the Network Interface configuration.
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