No dial tone in outside junction box

I can call my cell phone with a phone handset plugged into the Line 1 jack on the back of the modem.  I can call the landline number from my cell phone, but it doesn't ring the handset and eventually goes to voice mail.

The last time I had this problem the tech told me to check for a dial tone at the outside customer service box where the line comes from the pole.  There was no dial tone there, so he went up the pole that the phone line was fed from, jiggered some wiring, and I got my service back.

When I call the landline with the cell phone I hear the ring tones before the call goes to voice mail.