ACS is a global resource, but the 'data location' you select when creating the resource will be expanded to new geographies. We don't strictly align to azure 'regions'. The Data Location is the location your data will be stored at rest, but it could go into other geographies depending on your users (i.e. you select 'US as data location, but if a call is happening between users in Japan and Australia, some data will be going through those geographies)
You can certainly use ACS in India.
The list of geographies we are supporting at GA include:
- United States
- Europe
- United Kingdom
- Asia Pacific
- Australia