Methods, apparatuses and computer program products for routing a call from a circuit switched domain to a unified service domain

In a mobile communication network, a method of controlling an activation state of one or more IMS Centralized Services (ICS) client applications supporting ICS routing of a call from a circuit-switched access domain to an IMS unified service domain, wherein a first ICS client application is provided on the network, the method comprising the steps of:

• receiving a message from a terminal;
• detecting, in response to the message, that no second ICS client application provided on the terminal is to support ICS routing functionalities;
• and
• controlling an activation state of the first ICS client application depending on a result of the detection and activating or maintaining the activated state of the first ICS client application.

In a network, a network node for controlling an activation state of one or more IMS Centralized Services (ICS) client applications providing functionalities that support ICS routing of a call from a circuit-switched access domain to an IMS unified service domain, wherein a first client application is provided on the network, the network node comprising:

• an interface adapted to receive a message from a terminal;
• a detector for detecting, in response to the message, that a second ICS client application provided on the terminal is to provide the routing functionalities;
• and
• a controller for controlling the activation state of the first client application dependent on a result of the detection, and deactivating the first ICS client application.

In a network, a network node for controlling an activation state of one or more IMS Centralized Services (ICS) client applications supporting ICS routing of a call from a circuit-switched access domain to an IMS unified service domain, wherein a first ICS client application is provided on the network, the network node comprising:

• an interface for receiving a message from the terminal;
• a detector for detecting, in response to the message, that no second ICS client application on the terminal is to provide the routing functionalities;
• and
• a controller for controlling the activation state of the first client application dependent on a result of the detection, the controller activating or maintaining the activated state of the first ICS client application.