| ServiceCallAsync(DN, RPCParameters) | ServiceCallAsync(RegistrarRecord, RPCParameters) |
| ServiceCallAsync(RegistrarRecord, RPCParameters) |
Call to System Extension API Some system extensions may expose own API which allow to control specific aspects of the calls. For example: RoutePoint extension esposes media control API. Conference server exposes conference control API |
| ServiceCallAsync(String, RPCParameters) | ServiceCallAsync(RegistrarRecord, RPCParameters) |