HP LaserJet Pro MFP M521 series - The product uses a fax over IP or VoIP phone service

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The product uses a fax over IP or VoIP phone service

Set the

Fax Speed

option to the

Slow(V.29)

or

Medium(V.17)

setting.

a. From the Home screen on the product control panel, touch the Setup button.

b. Open the

Fax Setup

menu.

c.

Open the

Advanced Setup

menu.

ENWW

Solve fax problems

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d. Open the

Fax Speed

menu.

e. Select the correct setting.

Contact your service provider to make sure that fax is supported and for a recommended fax

speed settings. Some companies might require an adapter.