There is open source Jitsi Meet. Really good one. If you need to dial in, you can have a look at what Twillio offers, but you pay for almost everything there.
For nouse cancelling I would look for external tools
There are a lot of different options out there for audio conferencing. These support a landline dial in:
All of the above have free options, but it's usually limited to the number of participants and duration of the call
If you don't need to dial in you can also use Discord which has some really good noise suppression. Discord is ...