The agency collects the client's contact information and calls the escort.
Sometimes, it may be up to the escort to contact the client directly to make arrangements for the location and time of an appointment.
Generally, the escort is also expected to call the agency upon arrival at the location and upon leaving, to ensure the safety of the escort.
Working as an outcall escort is not an offence, and neither is working as a prostitute in private.
It is, however, a criminal offence to pay for services of a prostitute who is controlled for gain if any third party uses force, threat (whether or not relating to violence) or any other form of coercion.
However, there almost certainly do exist agencies that do go by these laws and do not facilitate prostitution.
Some countries have used a two-pronged approach of criminalizing street prostitution but permitting or licensing prostitution in brothels or via escort agencies.Prostitution in India is legal, In 2010, Mexico Legislators added a law similar to that of the UK called the Anti Trafficking in Persons Act (rough translation) which makes it a crime to offer the sexual services of another person against their will.The law is still broadly interpreted and has many websites who offered the services of escorts running for cover and even newspapers like El Universal stopped taking classified ads for escorts or "executive massages" because of the law which also goes after anyone promoting the trafficking of persons.Some agencies may specifically deal in a certain type of escort.There are male-for-male, female-for-male, and female-for-female escort agencies, as well as a few male-for-female agencies. Transsexual or transgender escorts are available from some escort agencies.In 2015 the HMRC set up a dedicated “adult entertainment task force” to collect unpaid income tax from, among others, online escort agencies.