Hello,
There is no option in VCS to route the call as audio or video.
It will just forward what ever endpoint will send in SDP and connect the call accordingly.
Also, if you check the search rule config there is no setting so it can understand whether call is audio or video. It will just match the called number and route the call accordingly and if the endpoint supports audio only it will connect the call as audio only.
Thanks.
Please rate if it is helpful...