Nice to see that somewhere on this planet there's a judge that understands how to reasonably apply the law when it comes to patents and copyrights.
Agreed. Good job judge.
A copyright on the sound is just fine, which they all acknowledge. An audio recording deserves full protection under copyright law.
But as a trademark, to say "the sound of a telephone is our distinctive mark", that is too broad. Trademarks need to be distinctive.
As their name implies they are distinctive marks indicating the creator or distributor of goods, they are brand indicators. The generic bell ringing is not a distinctive brand by itself. They could trademark a series of tones for your brand (like the NBC chimes) or a jingle or theme (like the Batman theme or the McDonald's "I'm Lovin It"), but not a simple ringing bell sound.