No incoming video ISDN

[JDTOKYO]

Hello, Im rather new to this so my apologies if this seems either inept or obvious.
I am having trouble connecting a Video conference over ISDN.
My system is a Tandberg 6000MXP my counterpart is also using a Tanberg unit. We have previously connected sucessfully to 2 VC rooms at my counterparts site which have dedicated ISDN lines.
However last week we tried to make a connection and the result was silence a black screen "microphone off at other side" and "no incoming video" displayed at my site.
My conterpart tells me that the room I was trying to make a connection to did not have a dedicated ISDN line but rather was connected to a Polycom/Accord bridge ISDN server.
I would appreciate any thoughts on how I might troubleshoot this issue.
Thank You

[Shawn Jones]

Sounds like the bridge had the audio and video muted...

[JDTOKYO]

thanks!
I will schedule another test later today.

[11B-33T]

Shawn's theory is very plausible JD. I've always encouraged customers to check their codecs connection state using the built-in diagnostics whenever possible. This is a big step in being able to effectively troubleshoot your endpoint before the hub or network gurus sing out 'it's on your end'...

[JustBuck24]

What version software are you running on the Tandberg? 6.0?

[JDTOKYO]

Hi.
Im running F6.1 NTSC
However I just got an email from my counterpart to the effect that I should upgrade to F6.3 to counter possible inter-operability issues.

[JustBuck24]

Are you connecting to an MGC Bridge?

[helix-2000]

Also might check the correct camera source is sleceted at the end point sending black video.

[JDTOKYO]

Yes it is an MGC bridge.

[ranjithvarier]

did u check the encryption option in Tandberg and MGC ??

[IC1sharp]

If you have Call status on your VTC unit, open it up and look at the
Audio and Video formats and packets coming into your unit.

[JDTOKYO]

Thanks for all the feedback. We do appear to have reached a successful conclusion. After trying various strategies we found that disabling all Video/Audio algorithims bar the legacy H.261 & G.711 resulted in a successful connection.

[cfaasen]

If you would have had the chance to verify H221 to see if the Tandbergs are connecting at H264+++