BRI was two bonded 64kbit channels. i think even with today's compression you'd be hard pressed to have a decent video call experience.
PRI was 1.5mbit, but i'm not sure you could dial out all the constituent channels. (i think it was designed to either behave like a standard leased line or as an endpoint for BRIs to dial into)
edit: looks like you can dial those out... but in practice it's either 2 channels at 128k or 6 at 384k. still not a lot of bandwidth for video (but probably great fixed latency)
fun fact: i looked at starting up an isdn based isp in the 90s. isdn calls were charged by the minute back then, which wasn't great for that purpose... but if you set up a centrex (the phone company's managed cloud pbx as a service), then you could make intercom calls for free between stations... so, the isp would have been a business with each customer site as a branch office. :)
PRI was 1.5mbit, but i'm not sure you could dial out all the constituent channels. (i think it was designed to either behave like a standard leased line or as an endpoint for BRIs to dial into)
edit: looks like you can dial those out... but in practice it's either 2 channels at 128k or 6 at 384k. still not a lot of bandwidth for video (but probably great fixed latency)
fun fact: i looked at starting up an isdn based isp in the 90s. isdn calls were charged by the minute back then, which wasn't great for that purpose... but if you set up a centrex (the phone company's managed cloud pbx as a service), then you could make intercom calls for free between stations... so, the isp would have been a business with each customer site as a branch office. :)