Telephony application services are provided through use of a service delivery platform (SDP) and by implementing a service-oriented architecture (SOA)-based approach. Various “widgets” of telephony functionality are selected, each widget providing functionality such as call forwarding, call blocking, conferencing, etc. These widgets provide not only call manipulation, but can provide the logic used to process a call. An application or application service thus can combine and/or compose these widgets as needed to provide telephony functionality.