I would like to know why you as a service provider does not allow multiple sign-ins. I am moving from axxess voip and had this functionality with them. Note that this was also a pre-paid service like yours. It meant I could sign in both my cordless as well as desktop phone at the same time and all would ring if I received a call.
I know this is an issue that can be resolved with DECT (even if you struggle to fine a DECT desk phone) but would like you to consider adding this as part of your package.
As a household I am sure that you understand that sometimes you want a phone upstairs as well as downstairs and maybe in the bedroom for convenience. This functionality should be part of your offering in my opinion.
We do have this functionality as part of our sister companies offerings. Take a look at www.euphoria.co.za
FreshPHONE will not offer this functionality in the drive to keep it free
Yes, DECT would be the best way to achieve what you are looking for