Hello,
Generally speaking, without knowing more about exactly what you are trying the answer is yes as long as you're using the Codian software on the MCU (i'm not sure if you can dial out from the MCU itself when using Telepresence server software).
The DX80 and Jabber users are able to dial in to a MCU by using the conference SIP Uri and you can add a SIP participant from the web interface of the MCU so therefore you can dial out to a Jabber user or a DX80 user by entering their SIP URI.