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3GPP R5 chose SIP as IMS signaling protocol. Initially SIP (RFC 2543) specifies UDP as the default transport
protocol. Then IPsec was chosen since it can protect all traffic regardless of transport protocols. Later, IETF moved
SIP direction to be more connection oriented, and mandated TCP as transport protocol. Thus, the previous
disadvantage of TLS goes away, since TCP could be assumed available when using HTTP in the context of IMS. In
current SIP specification RFC3261, the TLS is recommended as mean to provide security for UE and Proxy, by
utilizing sips: to indicate the usage. Thus, TLS is a reasonable solution for HTTP in connecting with IMS network.
TLS [3] was designed for HTTP. Other applications directly on top of transport layer, such as SMTP or FTP can
also utilize TLS. IETF has standardized TLS over HTTP. RFC 2818 describes how to use TLS to secure HTTP
connections [4]. RFC 2817 explains how HTTP1.1 Upgrade mechanism can apply TLS to an open HTTP
connection (HTTPS) [5]. Particularly, HTTPS is the dominant approach to securing HTTP
     
 
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