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![PDF] Transformation of PSTN to Next Generation Network The approach and implementation by Chunghwa Telecom | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/5a6e39610de248986c2e922d3e7fcc65e0667c90/2-Figure1-1.png "PDF] Transformation of PSTN to Next Generation Network The approach and implementation by Chunghwa Telecom | Semantic Scholar")
PDF] Transformation of PSTN to Next Generation Network The approach and implementation by Chunghwa Telecom | Semantic Scholar
