Dependencies & Limitations
1. VCB 4.25 can only be installed on English versions of Windows 2000
or 2003.
2. A VCB2000 that has been upgraded to a VCB2500 will only support a
maximum of 16 ports with the VCB2500 features.
Interoperability Problems
1. Tandberg endpoints cannot send or receive video data with size
greater that VGA.
2. Polycom VSX does not support H261 in H239 or in dual video.
3. Polycom and Tandberg do not support simultaneous live video and
video data channels in H264.
4. When Polycom fails to open data in a CP conference the VCB will not
allow it to send CIF video data on the live video channel.
5. Meeting Point fails to open video when connecting via a gateway to a
H263 conference due to the fact that it does not support H.263.
6. When Tandberg MXP 990 closes data channel all other endpoints
continue to receive black video on the data channel.
7. When Tandberg MXP 990 connects to the VCB configured to AAC audio
codec there are audio cuts.
8. For an H.263 CP conference Tandberg should be configured to Duo
Video mode.
Known Bugs
1. Endpoints that do not send a video stream may be displayed as black
or blue video.
2. AAC audio codec is not supported in multicast.
Fixed Bugs
1. Silence suppression mechanism no longer causes audio cuts.
2. Fixed issue that caused the 25th VCB service not to connect to the
MXM.
VCON Conferencing Bridge (VCB 2500) 4.2
1. Support added for G.722.1 (24k and 32k), G.723.1, AAC-LD and G.728
audio codecs.
2. Support added for H.263+ and H263++.
3. Support added for audio transcoding between all VCB audio codecs.
4. Support added for Symmetric Bandwidth in CP conferences.
5. Support added for Speed Matching in CP conferences.
6. Support added for H239.
7. Support added for mode switching between CP and VS and dominant
speaker, timer and fixed modes.
8. Support extended for FECC to include Annex Q of the H224 protocol.
9. Fixed an issue with G.711Ulaw that caused higher CPU consumption
mpared to G.711Alaw calls.
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Upgrading From VCB 2000
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