A telecommunications system is provided comprising a mobile device and an IP Multi-media Sub-system (IMS), the mobile device being connected to a Public Land Mobile Network, PLMN. The mobile device is adapted to: identify if the PLMN supports Customized Applications for Mobile network Enhanced Logic, CAMEL; and, upon receiving an attempt to initiate a call to a dialled number, if the PLMN supports CAMEL, allow the call to proceed. The PLMN is adapted to: receive a request to connect a call from the mobile device; invoke a CAMEL service trigger indicating that the call should be routed to the IMS; and, route the call to the IMS. The IMS is adapted to: control the call; and, refer the call to a call storage system for call storage. A mobile device, IP Multi-media Sub-system and method in a mobile device are also provided.