A telecommunications network includes a telephony application server (TAS). In some examples, the TAS receives, from a terminal, a session-initiation request identifying a called party. The TAS sends structured text (e.g., XML or JSON) identifying the called party (e.g., data of an anyTimeInterrogation query payload) to an information server (e.g., an HLR), which responds with structured text of a destination-terminal address dynamically bound to a terminal associated with the called party (e.g., data of a sendRoutingInformation reply payload). In some examples, the TAS receives Unstructured Supplementary Service Data (USSD) request data from a terminal. The TAS sends structured text indicating the USSD string and an identifier of the terminal to a USSD gateway via an Internet-Protocol-based Lightweight Protocol (IPLP), e.g., HTTPS, and receives structured text including USSD answer data. The TAS sends, to the terminal, a report message comprising the USSD answer data.