Locally checkout the [robertlong/full-mesh-voip](https://github.com/matrix-org/matrix-js-sdk/tree/robertlong/full-mesh-voip) branch of the matrix-js-sdk.
```
cd matrix-js-sdk
git checkout robertlong/full-mesh-voip
yarn
yarn build
npm link
```
Link the matrix-js-sdk into the matrix-video-chat project: