Hola,
Con la v11 pero ves la noticia en el articulo:
"Important: Starting from Version 5.5 of the Skype client, the Extras Manager is no longer obtainable. This effectively means that it is no longer possible to deploy the 3CX Skype Gateway unless you have access to an older version of the Skype client that still has the Extras Manager included."
Source: https://www.3cx.com/voip-gateways/skype/