[1] [CITE@en[draft-ietf-siprec-protocol-14 - Session Recording Protocol]]
( ([TIME[2014-10-16 12:40:30 +09:00]] 版))
<https://tools.ietf.org/html/draft-ietf-siprec-protocol-14#section-9>

[2] [CITE@en[draft-ietf-siprec-callflows-03 - Session Initiation Protocol (SIP) Recording Call Flows]]
( ([TIME[2014-10-16 14:55:59 +09:00]] 版))
<https://tools.ietf.org/html/draft-ietf-siprec-callflows-03>