IMS source code or a graphical object having corresponding IMS source code can be selected within the graphical user interface (GUI). The IMS source code can include a call out to an external application. An IMS call wizard can be invoked, which graphically prompts a user to specify call-out specific conditions for the external application via an ordered series of presented screens. Each screen can present a user with at least one selectable option. User-made selections from earlier ones of the presented screens can change options presented in later ones of the presented screens. IMS code can be generated to call out an external application in accordance with the user selections of the IMS call wizard. The generated IMS code can be inserted into the selected IMS source code. After the insertion, the IMS source code is operable to call out to the external application.