Method of setting up an application initiated call to a mobile station within a CAMEL network, and a telecommunications system comprising a CAMEL network

A method is provided of setting up a call connection to a mobile station operative to communicate with a Customised Application for Mobile Enhanced Logic (CAMEL) telecommunications network. The call is initiated by an Open Service Architecture (OSA) application, which causes a message to be produced which indicates to the network that the mobile station is now available to make a ring back call connection. The network setting up the call connection in response to the message.

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