I am trying to make video call between 2 ex 90 devices , both of them in the same LAN and registered in SIP to the same CUCM 11.5. The audio is working between the devices .
If the call is completing but the video is failing, there may be some difference in the endpoints' configuration in the CUCM. Does this happen no matter which endpoint initiates the call? You might check the SIP Profiles assigned to each device.
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