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References: RFC 3891: The Session Initiation Protocol (SIP) "Replaces" Header; SIP REFER (RFC 3515) for Call Transfer etc. Function Documentation pjsip_replaces_init_module(). Remote attended transfers are the type of attended transfers referred to in SIP specifications, such as RFC 5589 section 7. When I started working in SIP environment, it was confusing to me, as well. But after reading RFC3261, it became clear to me. Simply said, REFER method is used for transferring a call and INVITE is used to change session media information. Refer to the example below to understand it more clearly. Suppose Alice and Bob are on call and Alice wants to transfer call to Carol, Alice will send REFER to Bob with Carol information. REFER sips:[email protected]example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:506;branch=z9hG4bKnashds8.
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