Xerox M20i receives faxes but cannot send them? Integra telecom is the provider, i have a phone line tester that gives me a red lite vs the green which means the line is good(red means reversed polarity) Integra brought out there own fax and it works on this line? the customer has a Ricoh and the Xerox machine which both have the same issue of not being able to send faxes? any ideas?

If you look under the scan assembly you will see a yellow or green tab which locks the scan head. Try locking and unlocking it a few times then on the final unlock reboot your printer.

The jack that is labeled "line"

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Hello.

Typically, the problem is caused by a faulty phone line (even though you can make calls and send FAXes). Contact your telephone/telecom provider for their assistance.
Hope this helps.

To connect the machine for use as a fax machine, plug the cord into the left side of your machine, lower phone jack labeled LINE and the other end into the wall phone jack. To connect a telephone to your machine, plug into top jack on the left side of machine labeled EXT. Reference page 2-12 of this link to your Xerox WorkCentre M20i User Guide.
http://download.support.xerox.com/pub/docs/CopyCentre_C20/userdocs/any-os/en/UG_Eng.pdf

Is your phone line in the " line" jack and not the ext jack?
If the line is digital it will do that.
If the phone line voltage is low, the line current low that will also cause the problem.
In your fax settings. Is ECM turned ON.
Is Junk Fax OFF.
Secure Fax OFF.
Delay Fax OFF.
If your phone line is weak, it will cause that problem.

Is the phone line plugged into the "line" jack and not the " phone or Ext " Jack?

I was told by Xerox support tech that he thought it was the fact that we do not have a dedicated analog phone line, but the fact remains we can receive faxes but cannot send them. The only fax that will send is directly to Xerox support.???. The machine was working fine, faxing (sending and receiving), until about a week or so ago, when we had a repairman here on the printer. He told me to report the problem to our telephone repair service. He is coming out today! I'll let you know.

The machine itself can not give that message. You have some tye of phone line issue.

It sounds like the fuser rollers are not at the proper temperature to work.

They should be inspected by a technician.