TCP/IP Tutorial and Technical Overview - IBM Redbooks

Type Description
s Session name
i* Session information
u* URI of description
e* E-mail address
p* Phone number
c* Connection information, not required if included in all media
b* Zero or more bandwidth information lines
t Time the session is active
r* Zero or more repeat times
z* Time zone adjustments
k* Encryption key
a* Zero or more session attribute lines
m Media name and transport address
i* Media title
c* Connection information, optional if included at session level
b* Zero or more bandwidth information lines
k* Encryption key
a* Zero or more media attribute lines
For additional details, refer to RFC 4566.
21.3.4 Real-Time Transport Protocol (RTP)
The Real-Time Transport Protocol (RTP) provides the transport of real-time data
packets. To accommodate new real-time applications, the architecture was
intentionally left incomplete. Unlike conventional protocols, RTP is tailored
through modifications and additions to headers as needed. This allows the
protocol to easily adapt to new audio and video standards.
RTP implements the transport features needed to provide synchronization of
multimedia data streams.
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