ISDN C40 codec issue

Hello,
I am a video teleconference technician with an interesting issue, recently our higher headquarters made changes to our C40 codec. Since this has happened I am able to place ISDN calls and receive audio, but no video. During the call under system information it states that video protocols are off, I am not sure what controls that, as the menu option isn't displayed while not in a call. Our problem seems to be isolated to ISDN calls, as last night I was able to conduct a conference with full video and audio using IP. If anyone has had any issues with this or can provide any guidance on what changes need to be made I would greatly appreciate the help.
Troubleshooting Conducted:
Changed MTU Rate- Resulted in the Codec being unable to communicate with the ISDN interface
Tested using IP- Full audio and visual
-David

Hi David,
We'll need a bit more information on your topology and configuration. What call control is your C40 connected to? Standalone, VCS, CUCM?
How is your ISDN connected to your C40? An ISDN Gateway, a local Ciscl ISDNLink, via some other call mechanism?
Have there been any changes to your ISDN service? Have you changed providers? If so, does the new provider know you want to do video, or have they only configured an audio ISDN service?
Also the version numbers of the equipment/software could prove useful to assist with troubleshooting.
Cheers
Wayne
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