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Member and Cluster routing are part of the ANSI specifications. Default and Network routing are an enhancement in the Signaling Platform MTP3 implementation. 

While ITU specifications only mention Member routesets, where a PC can be treated as a simple number, the Signaling Platform routeset implementation supports all four routeset types (MEMBER, CLUSTER, NETWORK, and DEFAULT) in all SS7 Variants for a possibly more flexible configuration.

The Cluster and Network routesets are available as an option in all SS7 Variants for the Signaling Platform. Therefore, the PC Routing Format must be specified when creating an MTP3 NA to indicate which part of the point code is the network, cluster, and member. If the Cluster and Network routeset types are not required for a given ITU deployment, it is recommended that you set the MTP3 NA PC Routing Format to 3.8.3 to agree with the ITU Q.708 administrative boundaries. Alternatively, in a national deployment, you can set the PC Routing Format to correspond to the administrative boundaries of the national organization.