Fax calling my landline. Typical fax pattern, 3 calls close together as someone's machine makes the normal 3 attempts. Then some free time, and a second set of 3.
I get these types of calls from time to time. They are a fax as noted above first from the Texas number and then 2 calls from Germany, 1 from Argentina and 2 more from Germany. These are coming to my cell so there is no way to forward to my fax machine.