HP Officejet Pro L7500/L7600/L7700?

I am having problems sending faxes. Comes up with a different error code every time. We are getting a dial tone and it says "connecting". When it does not fax it spits out a page that gives the errors codes and says there was a connection problem. Please Help!

error 388* 321* 344*

I would recommend getting a shielded phone cord and make sure your phone cable isn't touching any power cables (It can cause line noise) as a starting point. If possible, please post one of your error codes please.

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