Real-time audio only meeting

Dear,

We are looking for some technical advise about which Microsoft technology to use for streaming audio only.

We were analysing Azure Communication Services although we are not sure if this is the best option.

Requirements are:

- must be real time

- audio only

- few publishers (max. 5)

- 100-500 subscribers 

- client (for publishers and subscribers) is required to be integrated in our application

Would Azure Media Services or Azure Communication Services be good options for this? Are there any alternatives?

Thank you