RingCentral Meetings video / audio sync issue when using dial in

We are trying to set up a video call in our boardroom using a PC to handle the camera and video (displayed on a large wall mounted screen) and a conference phone for the audio (dial in). It all works but there is quite a noticeable delay between the video on the PC and audio on the conference phone.

Is there a way to adjust the the latency to try and sync the the two devices?