Can i install at the same time a mumble client and server, so that it can streams the audio while hosting?
I already have a murmur raspi but i'm wondering if this is possible.
Yes, that ought to work fine. However, you may have to play around with connection settings. Depending on your network setup, you may need to try connecting the client to 127.0.0.1/localhost, or the Pi's private IP, or its public IP (if it has one)