GLInsight with FAX for PSTN is a powerful and feature rich offline software tool that analyzes pre-recorded PSTN fax calls. The software demodulates the PCM stream, decodes the fax protocol between the endpoints, and provides the results in a user-friendly textual and graphical format. V.34HD, V.17, V.33, V.29, V.27, V.21, T.30, and T4/T6 are all supported along with Tiff image reconstruction