No dial tone - no phone service

I plugged a landline directly into modem port 1 and DID get a dial tone.

I guess that means the wiring in my house is faulty. I still need a technician to find and fix the problem.

What else can I do?

Already done, Jonathan. Thank you for your help.

One other thing: I realized that the only thing that changed in our telephone wiring is the installation of the VoIP telephone modem. If the modem isn't at fault, it must be the wire that connects it to the rest of the house's phone wiring. I looked at that connection and it looks pretty jury-rigged to me. There could be a bad connection there.

So, I plugged our wireless phone's base station directly in to the VoIP modem so that the slave wireless units could work - and they do. At least we have  phone service until this is corrected.

So, again, thanks for your help.

Yes. Plugging directly into the VoIP modem is temporary.; not permanent. I need someone to fix what's wrong with the house's phone wiring so the phone jacks around the house work. Right now, none of them do.

I have seen something as simple as a spider's cobweb inside the phone jack touching the red and green pair (center 2 'prongs' in the phone jack kill a line.  Opened the jack, brushed the jack with a toothbrush, cleared the problem.  Worse in humid climates.