According to one aspect of the present invention, there is provided a SIP network element, for processing messages received from other SIP elements in a network of SIP elements, wherein the element is adapted for receiving a predetermined type of SIP request, the request comprising a plurality of headers and data associated with each of the headers, the element further comprising: a message search function adapted for extracting data from a predetermined selection of said headers, processing logic for processing the extracted data; means for creating a predetermined type of response message associated with the received request, the response message comprising data extracted from the received message; and means for sending the created message to a destination identified in the created response message.