Thanks for keeping us in the loop.
Humour
Welcome to the forums.
In future try reversing by putting details in the body and the issue in the subject line.
Have you looked at the fax reports from the fax machines? might tell a story.
What has been done to try to troubleshoot so far?
What the ATA setting are on the Norstar and Fax settings on the machines on site.
FYI - MICS 6.0 and 6.1 has known issues with PRI, fixed with 6.1MR or up.
Things to try
Fax machine:
-Try manual mode
-Changing the Transmission speed can help indeed....9600 baud or lower.
-Also try disabling ECM on the Fax.
-Change T.38 to G.711 on the fax machine if such a setting.
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