portunus: It would impose far more of a cost on the country to throw away working equipment and replace it before the end of it's useful life.
Agreed. I hate throwing out anything. I even more hate throwing out something that still does that it was originally intended to do and works just fine.
But the old gear needs to go, and so do the old standards that go with it. SS7 has had it's day and it's time we moved on to more up to date protocols on modern platforms so we can leverage the benefits that the new features can and do deliver.
It's like fax, that needs to go too. Telex is long since gone, so are telegrams.