A telecommunication system includes a first radio access technology having a first radio access network and a first network core operable to page a mobile terminal via at least one element of the first radio access technology. The telecommunications system also includes a second radio access technology having a second radio access network and a second network core operable to page said mobile terminal via at least one element of the second radio access technology. Each of these elements may receive the page from its radio access technology, determine whether the mobile terminal is registered with that radio access technology and notify its core network if the mobile terminal is not registered. The core network may cause the mobile terminal to be paged in the other radio access technology. Different timer periods for idle timers at mobile terminal and eNodeB may avoid possible loss of mobile terminating data.