The Session Initiation Protocol Refer Method
RFC 3515, “The Session Initiation Protocol Refer Method”, is a Proposed Standard document published in April 2003 by R. Sparks. It has since been updated by RFC 7647, RFC 8217. The canonical text is published by the RFC Editor.
Abstract
This document defines the REFER method. This Session Initiation Protocol (SIP) extension requests that the recipient REFER to a resource provided in the request. It provides a mechanism allowing the party sending the REFER to be notified of the outcome of the referenced request. This can be used to enable many applications, including call transfer. In addition to the REFER method, this document defines the refer event package and the Refer-To request header. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 3515 is hosted at rfc-editor.org. Available in TXT,HTML.
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