The video group logically interfaces to a service instance with a video Service Access Point (SAP). Like a SAP for connectivity services, the video SAP allows the assignment of an ingress and egress filter policy and QoS policy.
Ingress and egress directions for the filter and QoS policy are named based on the perspective of the router which is the opposite perspective of the ISA. An ‟egress” policy is one that applies to traffic egressing the router and ingressing the ISA. An ‟ingress” policy is one that applies to traffic ingressing the router and egressing the video. Although potentially confusing, the labeling of ingress and egress for the ISA policies was chosen so that existing policies for connectivity services can be reused on the ISA unchanged.
If no filter or QoS policy is configured, the default policies are used.
One of the key attributes of a video SAP is a video group association. The video SAP’s video group assignment is what determines which video group services on that video SAP. The video groups configuration determines what video services are available.