Welltech VoIP ATA series V.303 - Manual (Page 16)

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button, LP399 parameter will save to 『.csv』file format (See Figure 4).
(Figure 4)
Step 4: Open the file, then check [Phone Book] number data (See Figure 5).
(Figure 5)
 Import Featuer
Step 1: Set up 『.csv』 format for [Phone Book] data (See Figure 6).