I've put it in the VoIP forum, but I believe it originates from telecom.

Since about 7pm yesterday, at 19:01 and 19:27 we reeve vied calls from a number known to us, with no one on the other end. This happened at 20:01 and 20:27 and so it carried on until I set a do not disturb setting on 2talk.

Then starting at 13:01 today it started again. I've since blocked the number. We've contacted the owner of the number and they insist it's not them....and I'm inclined to agree given how regular it is.

Any thoughts to options? Would this be better handled from my side (2talk) or theirs (telecom). - something that may complicate things....it was our house and we ported the number to 2talk from that connection before they moved in.