In Internet telephony, there must be a means by which new services are created and deployed rapidly. In the World Wide Web, the Common Gateway Interface (CGI) has served as popular means towards programming web services. Due to the similarities between the Session Initiation Protocol (SIP) and the Hyper Text Transfer Protocol (HTTP), CGI is a good candidate for service creation in a SIP environment. This paper defines a SIP CGI interface for providing SIP services on a SIP server.
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