My company uses video conferences regularly.
Today I had a vendor in and we were in one of our conference rooms where we all sit at a half moon desk and face the camera and screen where we see the other sites.
We have trained our staff on best practices.
One is to make sure you don't spend a lot of time with your head turned only talking to those in the room your in, that you actively include and engage with the people at the other sites.
In today's meeting, the vendor, the presenter of the topic, spent 80% of the time with his head turned to talk to me or a co-worker seating on the other side of me. If this was an hour meeting, it wouldn't have bothered me, but we were in the meeting for 6 hours. At one point I stood up and moved behind him hoping he'd redirect his attention forward but instead he turned all the way around to address me. Then after a break, I moved to his other side so that one of us was on each side of him, but then he just swiveled his head back and forth between us. The only time he'd present facing the camera was if someone from another site asked him a direct question, and even then, he'd look at them while they were talking and then turn to one of us to answer.
I couldn't figure out a polite way of encouraging him to engage with the others with out coming across as "tutoring" him, which I didn't see as my role. But I felt bad for the other sites as it would appear to them to be slightly excluded from the conversations.
What would have been an appropriate method of suggesting that he spend more time facing the camera?