User's Manual

Call Admission Control
Administering Avaya Video Conferencing Solutions 6.1 37
DRAFT
Call Admission Control
Overview
Audio and multimedia calls require high bandwidth and low latency for best user experience.
Call Admission Control (CAC), also known as Bandwidth Management, provides an efficient
means to prevent degradation of quality by limiting the number of concurrent calls over limited
bandwidth links. CAC enables in sustaining the network load imposed by the media traffic over
the IP network.
Administering Call Administration Control
Session Manager allows bandwidth management for a given location by administering the
following details in the Location Details page:
1. Specify managed bandwidth usage for the location in the Overall Managed Bandwidth
section.
2. Specify average bandwidth per call for the location in the Per-Call Bandwidth Parameters
section.
Based on the location level settings as mentioned above, Session Manager provides the
following set of CAC functionality using Session Description Protocol (SDP):
1. Recognizes different types of calls categorized either as audio or multimedia. Multimedia
includes video and other forms of non-audio media sent by endpoints as part of a session.
2. Provisions a second, lesser limit on the bandwidth usage permitted for a location. This
second limit applies only to multimedia calls (Multimedia Bandwidth) and prevents such
calls from consuming too large a percentage of the available bandwidth of a location (Total
Bandwidth).
3. If the Total Bandwidth is left “BLANK” then Session Manager does not perform CAC for calls
in the Location.
4. Allows audio and multimedia bandwidth sharing at a location by selecting the option Audio
Calls Can Take Video Bandwidth.
● If selected, then Session Manager considers only the Total Bandwidth when deciding
whether a new audio call can proceed.
● If not selected, then Session Manager considers the Total Bandwidth minus the
Multimedia Bandwidth when deciding whether a new audio call can proceed.