[REFS[
- [1] [CITE@en[RFC 5621 - Message Body Handling in the Session Initiation Protocol (SIP)]]
([TIME[2009-09-12 07:37:40 +09:00]] 版)
<http://tools.ietf.org/html/rfc5621#section-9.4>
- [2] [CITE@en[RFC 5621 - Message Body Handling in the Session Initiation Protocol (SIP)]] ([TIME[2014-09-14 07:55:49 +09:00]] 版) <http://tools.ietf.org/html/rfc5621#section-12.1>
]REFS]