described are methods and apparatuses , for selectively terminated custom application in a telecommunications network . a gateway mobile switching center receives a request to initiate a call session to a subscriber device in a service area of a first mobile switching center . the gmsc established a dialogue to implement the custom application on the subscriber device . the gmsc receives a message indicating that the subscriber device is moving from the first msc to a second msc . the gmsc analyzes a service key of the custom application to determine if the dialogue should be terminated and determines that the dialogue should be terminated so that the custom application is continued on the subscriber device .