Your HD-Phone Ascona has a choice of 13 ringtones. You can select different ringtones for internal and external calls.
Change settings directly on your handset:
You can now listen to all the available ringtones and save your favourite one.
You can assign a different ringtone for every directory entry so you can recognise when a family member is calling by the ringtone, for instance.
On your handset press Menu > Directory > Add and select the required ringtone via the note icon.