The section "telephony (provider perspective)" is some detailed information IBM needs to know to configure the gateway regarding call signaling from and to the provider. "TON" (Type of Number) is information of the ISDN protocol and says whether the call is tagged as national, international, unknown… and is set by the provider.
We had an issue in Poland where this information from the local provider was not what IBM expected and cost us several hours to get this information. So they decided have this information collected before every rollout from the local provider.
So please contact your local provider and let them fill out this chart. They should know these details.