This Recommendation provides information on when and how to use the generic extensible framework (GEF) defined in [ITU-T H.323]. It does not repeat the text from [ITU-T H.323]. Instead@ it expands and elaborates on the text in [ITU-T H.323] and thus should be read in conjunction with [ITU-T H.323] rather than being viewed as a substitute to it. The main topics covered by this Recommendation are: when to use GEF@ how to specify GEF modules@ and examples of the GEF negotiation mechanism.