Outcall refers to when an escort comes to the client rather than the client coming to the location of the escort. Some escorts or escort services operate on an outcall only basis. This is the opposite of an incall.
More About Outcall
Outcall esccort services have pros and cons for both the escort and the client. This type of escort service is, generally, more expensive than incall service. It poses greater risks for the escort. This might also be referred to as a housecall when being tounge-in-cheek about the services being provided to the client.