Rodrigo,
The ACE contexts are isolated from each other. You could use a sorry server in another context, but you would have to go to another device to bridge or route the traffic to the other context. This means getting creative with the traffic routing using VRFs and NAT. This would create a bridge between your two ACE contexts. If they are in separate security zones you would not want to do this.
It would be best to create a local sorry server for this context to use.
Regards
Kris