HCS Dial Plans
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* Type 1 Dial Plans require handling of ISP prefixing/stripping.
  It's suggested that ISPs are stripped inbound to remote leaf,
  required possible static Partition/CSS and Translation Pattern
  configuration - for both Called and Calling Party.
* Inter-cluster Call Forwarding to Offnet destinations still requires
  some thought.  Inter-cluster Onnet call flows use Enterprise number for CLI/RDNIS.