I setup the equipment of Cisco Systems since 1997. With this model I have not experienced, but I set up AS5300 and AS5350 total of about 10. Of these, about half tuned to the voice configuration. I configured Cisco AS5350 for both H323 and SIP protocols. Access server acts as a gateway for VoIP operators, as gateways for the prepaid cards platform, for long-distance traffic termination.
From your query it is not clear appointment of the mux. It is also not clear whether I need to configure this mux and conference bridge. If you need to configure them, too, tell the vendor and model.