Embodiments of protocol converters (PCs), and related techniques, are disclosed herein. In some embodiments, a PC may include reception logic to receive Extensible Markup Language (XML) data transmitted by an Application Function (AF), conversion logic to convert the XML data into a Diameter Protocol (DP) message, and provision logic to provide the DP message for transmission to a Policy and Charging Rules Function (PCRF). Other embodiments may be disclosed and/or claimed.