Background

• Comparison of HTTP and SIP

• - Both are request-response protocols

• - Both are text-based application-layer protocols.

• - SIP supports most of the security measures attributed to HTTP like SSL/TLS, S- MIME, HTTP-Authentication [7]

• Contrast between HTTP and SIP

• - While HTTP is originally stateless, SIP can be stateful or stateless.

• Note: SIP is a session-layer protocol but referred to as Application Layer due to absence of session layer in TCP/IP Model [8]