alt Hacker News> many telecoms are reluctant to do it.
This really buries the lede. Telecoms are reluctant to do it because 'doing' it isn't aligned with their priorities.
Why would a telecom risk bankruptcy by investing heavily into a system that their competitors aren't?
If you want a back-door to exist (questionable) then the government either needs to have strong regulatory compliance where poor implementations receive a heavy fine such that telecoms who don't invest into a secure implementation get fined in excess of the investment cost or the government needs to fund the implementation itself.
Yes, telecoms should be forced to invest in their own security if they're not doing it. But the focus on the back door misses the point in my opinion. Even if the back door wasn't there, you wouldn't want nation state hackers anywhere near telecoms since they're critical infrastructure.