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SIP Messages
The SIP message format consists of a SIP header
section and the SIP body. In request messages, the first line of the
header section is the request line, which includes the method type,
request-URI, and protocol version. In response messages, the first
line is the status line, which contains a status code. SIP headers
contain IP addresses and port numbers used for signaling. The SIP
body, separated from the header section by a blank line, is reserved
for session description information, which is optional. J-series devices
currently support the Session Description Protocol (SDP) only. The
SIP body contains IP addresses and port numbers used to transport
the media.
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