A deny-by-default ACL for all VVoIP endpoint VLAN interfaces must be implemented on VVoIP non-core routing devices as defined in the VVoIP system ACL design.

Router ACLs are required to control access and the flow of traffic to and from VVoIP system devices and their VLANs as a protection mechanism. In general, the defined ACLs are designed in a deny-by-default manner such that only the protocols and traffic that needs to reach the device or devices in the VLAN receive the packets. The ACLs filter on VLAN, IP address and subnet, protocol type, and associated standard IP port for the protocol. In general, the ACLs mentioned are egress filters (referenced the router core) on the VLAN interfaces. Additionally, the routing devices should log and alarm on inappropriate traffic. An example of this is an HTTP request sourced from the data VLANs to the endpoint or media gateway VLANs. The primary purpose of ACL on all VVoIP VLAN interfaces is to block traffic to or from the data VLAN interfaces. Similar restrictions are placed on a dedicated VTC VLAN interface, however, VVoIP media and signaling is permitted in the event a VTC unit needs to communicate with the UC system.