It literally does not matter what Teams does - even if Teams maliciously did every wrong thing they possibly can, it's the duty of the phone manufacturer to ensure that 911 still works, it's Google's duty to ensure that Teams or any other app can't break emergency calls no matter how they try; the law literally requires the phone to recognize that a 911 is being made and override any programming (e.g. Teams) that may interfere with that. If Google can't do that with an over-the-air update, they can issue a full recall for all the affected Pixel phones.
My understanding is that emergency calls for any global locale are supposed to be an entirely separate band of communication from regular phone calls — e.g., they must work even without a SIM card, an account, etc.
So, emergency calls should be ENTIRELY OUT OF SCOPE FOR ANY APP software. Period.
It should be a low-level override/bypass, and NO app software software should ever be allowed to even touch emergency calls, let alone required to handle them.
Expecting all apps to handle life-critical emergency calls correctly is a profoundly stupid idea, guaranteed to produce a multiplicity of failures (and if that expectation did exist, Google must damn well announce it as a deadly serious requirement in bold, uppercase, red flashing letters to anyone wanting to use phone_call_handling permissions, but they don't, afaik).
So, we don't need to know anything about Teams or other app software in this case, only about the emergency calls side/back channel, and that any app, including Teams, will ZERO responsibility for handling emergency calls, or even ability to touch them.
So, it is Google that effed up big time here (regardless of Teams' other issues). Unless you make a solid case for the profoundly stupid idea that all phone-related app software should be responsible for handling life-critical emergency calls, your statement is plainly wrong.
> Mobile telephones manufactured after February 13, 2000... must incorporate a special procedure for processing 911 calls. Such procedure must recognize when a 911 call is made and, at such time, must override any programming in the mobile unit that determines the handling of a non-911 call.
It doesn't matter what Teams does. Android is required to ignore Teams in the case of an emergency call. That's the law.
