The Hold and Transfer features are usually implemented on the client side. The Ingate box has no special support for this, as it is part of the standard SIP signaling, which the Ingate box forwards anyway.

The Call waiting feature is sometimes implemented in the server instead of the client. The Ingate box has no such feature, but will forward any signaling for clients implementing this.

There are no extra settings for these functions; the settings allowing normal calls to be successfully set up should be enough, provided that the features themselves are implemented in the clients.