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Identifying OCN, NPA, NXX, LATA type data from SS7

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Hatari
Identifying OCN, NPA, NXX, LATA type data from SS7

Hi,
I am working on a learning research project on how toll free numbers work. From my conversations with long distance carriers in the US, they indicated that they charge based on where the call is originated from. When they bill, they would indicate the cost, NPA, NXX, OCN, ....etc

The question I have is how can I derive similar information real time during call setup in SS7? :( not sure which fields and layers I need to look in.

I would really appreciate some help from experts in SS7 out there.

Thanks
Hatari

Hatari
What I seem to read is that

What I seem to read is that the OPC (originating point code) may provide a starting point for this. I am not sure how this would be affected depending on a F-Link or A-Link SS7 connection.

Hatari~