I've been told by one of our guys in IT that our VoIP network is separated from the data network using a VLAN. From what I understand for security these two networks should never interact with each other (unless through firewalls etc perhaps?).
Last week one of the guys who administrates the VoIP setup told me that certain services like DHCP are shared services so they are used by the data network and the VoIP network. Is this acceptable or can this pose a significant security risk?