OfficeJet Pro 8720 - Fax will not communicate with all machines

[momodell0611]

Fax machine sends error 344 or 388 when trying to communicate with some machines.  We have changed cords and checked connection at wall.

[The_Fossette]

@momodell0611,

Welcome to the HP Support Community!

You get this error when the remote machine failed to respond to a fax command from the local machine because the connection was interrupted. These errors can occur if the phone lines in the area to be faxed are old or there is noise (static on the phone line). Other reasons can include power outages and other power-related problems.

I recommend you retry the fax reception when telephone line conditions have improved. Call the telephone provider if line conditions fail to improve.

Please refer to the below article for more information.

https://support.hp.com/in-en/product/hp-officejet-pro-8720-all-in-one-printer-series/7902032/documen...

Let me know how it goes and you have a great day!

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Cheers!