I admit to 'stumbling through' the set up of my Diverse phones, but what I have is two of the three 'linked' to the VOIP on the Gigaset box and the third just 'linked' to the Diverse base station. The Gigaset box enables you to select the landline as a second routing. Apart from the minor inconveniences it works well - I can get two different calls on the VOIP number at the same time AND call and receive on my landline number on the third handset, while the Diverse ansaphone works well on the landline.
Just wish I knew what I had done......
Edited by mikejp (Tue 29-Sep-15 09:07:53)