Before, the customer used iptable as firewall deployed in the headquarter and branch. Then they replaced the headquarter ipstable with Huawei firewall Eudemon1000E-X6. The other feature worked well but there was a problem when making a video phone call.
The topology is as follows.
During the video phone call, the customer in the branch can see the video picture and can hear the sound from the headquarter, but the customer in the headquarter can’t see any video picture and can’t hear any voice from the branch.