A telephony mashup is a voice, Web or mobile application (VoiceXML, PBX, IVR, VoIP, SMS, Text Messaging, etc.) that combines content from more than one source to create a new user experience. Qualifying entries must demonstrate how an application can use one or more sources of content in an inventive way to benefit users.

Any tool or platform that involves content (see StrikeIron or ProgrammableWeb) telephony (ex: VoIP, SMS, Text Messaging, PBX, IVR) can be used to create a mashup. This is uncharted territory, so there is plenty of room to use your imagination!!