Assign a number to a Teams channel to receive SMS

Hi YourFavoriteCollabMSTeams555555,

if you have Teams calling in place for this and you assign a phone number to a Teams call queue (via a Teams resource account) which routes the call to a Teams channel will start to play music on hold before anyone can get the call answered.

Some time I ago I wrote and blog post giving an high-level overview on calling in Teams channels: 

Calling gets integrated into channels within Teams in Microsoft Teams – erik365.blog

As of now there is, as you mentioned, no native solution that the SMS is received in a Teams channel with Teams voice capabilities. For this purpose you need a third-party app/services which provides the SMS capabilities and can send it into a Teams channel. 

In this case you should get the phone number from the third-party app/provider, you don't assign the phone number to the channel, you assign it to the "flow" which brings it to the channel to which it should be sent.