I agree with most people here on the above. We have been testing the PSTN functionality (Phone System) for a couple of months now, I can not believe caller ID display is still not being sent...the roadmap shows : Microsoft Teams - Reverse Number Lookup : status -> Rolling out Q4 - 2019. This has been going of nearly 3 years now!
It just takes way too long and is unacceptable, especially if Microsoft wants to push this as an Enterprise Voice system. Anno 2020, no calling ID...
Like Sean Ellis mentioned, basic functionalities that are missing is a faux-pas, and plain unacceptable. No decent volume/recording controls for example. People wanting to dial someone are only shown the mobile field, not the TelephoneNumber field. I mean, who designs/thinks of this? Some feedback to Microsoft..maybe sit together with your install base, or at the very least, try to include all voice options that were already present in SfB.
It took me an hour or 2 to make a bit of a wiki on Teams, just to realise afterwards the lack of a search function and the ability to export the wiki data to another channel...(facepalm). Uservoice has been demoted to a complaint-section, without any decent feedback from Microsoft. Shame, really