Call admission control using locations based on the Resource Reservation Protocol (RSVP) has one specific advantage over standard locations-based call admission control, that is, it is topology-aware. This is particularly beneficial in the case of link failures where standard location-based CAC would be unaware of the failure and unable to compensate the actual available bandwidth, potentially leading to oversubscription and degrading call quality.
This recipe assumes locations already exist in the system and any associated devices are ready to be configured for RSVP.
Media resource groups and media resource lists are required to function; these are discussed in Chapter 3, Media Resources and Music on Hold, so the detailed steps are omitted here.