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Conveying Feature Tags with the Session Initiation Protocol (SIP) REFER Method
RFC 4508

Recipient expansions

Mail trigger	To	Cc
doc_added_comment	rfc4508@ietf.org, sip-chairs@ietf.org
doc_external_resource_change_requested	mankin@isi.edu, sip-chairs@ietf.org
doc_state_edited	mankin@isi.edu, rfc4508@ietf.org, sip-chairs@ietf.org
ipr_posted_on_doc	rfc4508@ietf.org	ipr-announce@ietf.org, sipcore@ietf.org