Raspberry Pi as an intercom. How to transmit sound?

Question

Raspberry Pi

Hello.
A project is planned that is essentially similar to an RPI-based video intercom.

Tasks of the developed software:

1. Transferring a video stream with sound from the server to the client connected to the server using a web browser. (Everything is clear with this)

2. Transferring audio from the client's microphone to the server and playing it through the audio output of the Raspberry Pi. - here the question is: How to do it easier and more reliably?

Answer 1

https://ab-log.ru/smart-house/asterisk/sip-doorphone-v2 look here