I assume you're using for your TMS phone book source "File Based Phone Book", I've had an issue similar to this in the past where I created a .csv file and it wasn't able to be loaded. I just created a new Excel document with a single sheet, and saved it as a "CSV (Comma delimtted)" file, and was able to upload it to TMS. Are you doing the same thing, or something similar?
You might try 'exporting' one of your existing phone books and seeing what format that is stored in. Importing would be the same format. Also, the location of your 'file based phone book' has to match where you upload the file to import.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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