DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-94Multimedia Call Handling
1
Solution
In the first type describ ed above, wiring p roblems, power to the camera, or vid eo
encoder circuit pack problems in th e codec are typic al causes.
In the second type, no vid eo from an endpoint typic ally occurs bec ause it is not a
valid video source. This c an be checked by looking at pag e 1 of the Status
Conference x Endpoint y Vid form und er the Capability sec tion. In this section, a
“y” or “c” suggests that the end point has video. An “ e” means ept has not
declared any video capability in c ap set, “n” is aud io only, and “blank” means
audio add-on.
Also check pag e 1 of the Status Conference x Endpoint y Vs form for indic ation of
the video state for the endp oint values.
Calls Terminate Correctly but Are Unstable
Description
A number of conditions will lead to some or all endp oints having stability
problems during the course of a conference. A lac k of stability from an endp oint
is noticeable by a lac k of a video switching while the party is the only talker or
excessive disconnec ts from that endpoint.
Synchronization
Generally, the most common problem is a mismatc h in synchronization sources
between the endpoint and the DEFINITY MMCH. This typically causes low-level
(Px64) handshake problems that can tr igger the endp oint/MMCH to disconnect
the call. The MCCH’s timers are set to sufficiently high values so that, no rmally,
the endpoint will timeout and disconnect first. If insta lled in a customer network, it
is a good idea to p erform an audit of the path sync hronization is being supp lied.
If there are different clock sources betwee n endpoints and the DEFINITY MMCH,
some problems are sure to occ ur. The severity of these problems can rang e from
a handshake failure every few second s to one per day. Depending on the type of
endpoint, this can c ause the endpoint to disc onnect or just freeze video until the
main problem is resolved.
Specifically, PictureTel System 4000 endpoints seem to be the most sensitive to
instability. The Lucent Technologies Vistium also disconnects fa irly infrequently.
Last, the CLI Rembrandt II VP freezes video and waits for framing to be
recovered .
Network Configuration Concerns with Synchronization
When auditing a network for synchronization, avoid unnecessary hops. Thus, a
switch providing star-configuration sync hronization is preferred over a
daisy-chain config uration. Additionally, if there are DEFINITY PBXs that have
EPNs, synchronization should be provid ed to sub nodes from the sam e port