User's Manual

Design and deployment
42 Administering Avaya Video Conferencing Solutions 6.1
DRAFT
Allow reasonable VPN connection rates.
Avaya recommends that for Avaya one-X
®
Communicator the VPN connection rates have a
less than 150-ms one-way delay to Communication Manager, a packet loss less than 1%, and
jitter less than 20 ms. The Avaya one-X
®
Communicator does not support automatic bit rate
downgrades on packet loss feedback, nor does it perform ping tests for video assessment. The
user must reduce call rate and re-attempt the call to achieve the best video experience for the
network conditions. In worst-case conditions, users may experience video disablement by
Communication Manager for the call duration due to excessive video update requests.
Account for video call scenarios that cross more than three
Communication Manager systems.
Note:
Note: A limitation of the solution is that shuffling to direct-ip is blocked for
Communication Manager systems that are pushing tandem trunk-to-trunk
multimedia calls. Hairpinning is allowed.
Administer additional trunks to minimize the use of tandem Communication Manager systems,
thereby reducing video-update latency. Avoid the use of slow CPU servers in tandem
scenarios, since video signaling across many Communication Manager systems is
exponentially more expensive than audio-only calls.