Hello Pietro,

this is a passthrough ID of Devices App that links to the particular device.

If you check the URL carefully, you are accessing the IP address of the Devices App Service, not of the phone. the Devices App Service authenticates and forwards the request to the IP address of the phone.

See the Devices API for more info on obtaining the URL:

https://sdk.innovaphone.com/14r1/web1/com.innovaphone.devices/com.innovaphone.devices.htm

Best Regards

Andreas Fink

P.S.: I still think it is easier to implement a call via RCC.