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9971 video call problem with switch 3com

Hi

I have a problem I describe below

The problem is do I have 3 sip phones 9971 the phones can make a phone call but when i Try to do a video call don't working i have a switch 3com 4500G enabled with voice vlan

Also I configured all the port over the switch like a trunk but neither worked

someone set up something similar?

thanks.

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