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Network and PBX-Network Requirements
Issue 3 January 2008 19
Question 4: Does the VPN connection for Avaya IP Softphone have less
than 150 ms one-way delay to Avaya Communication Manager, is packet
loss less than 1%, and is jitter less than 20 ms?
Yes.
No. Avaya IP Softphone 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 reattempt the call to achieve the best video experience for the network conditions. In
worst-case conditions, users may experience video disablement by Avaya Communication
Manager for the call duration due to excessive video update requests.
Question 5: Are there video call scenarios that would cross more than three
Avaya Communication Manager systems?
Note that a limitation of the solution is that shuffling to direct-ip is blocked for Avaya
Communication Manager systems that are pushing tandem trunk-to-trunk multimedia calls.
Hairpinning is allowed.
Yes. Administer additional trunks to minimize the use of tandem Avaya Communication
Manager systems, thereby reducing video-update latency. Avoid the use of slow CPU servers
(for example, S8700) in tandem scenarios, since video signaling across many Avaya
Communication Manager systems is exponentially more expensive than audio-only calls.
No.