compression
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... application layer protocol. Examples of
these layers are transport layer security and compression. If DNS
was used to discover the availability of these layers for a
...
... transport security and SigComp for signaling compression, would
need the 8 DNS entries listed below:
...
... an application layer mechanism to express support of signalling
compression is needed.
Note that for historical reasons both HTTP ...
...
A SIP element that supports compression will need to be prepared to
receive compressed and uncompressed messages on the same port. It
...
... URI for subsequent requests that
are sent through the same outbound proxy using compression.
RFC 3261prop ...
... sigcomp in their registrar. All incoming requests for the
user will be sent to this SIP URI using compression.
...
... response MUST NOT be compressed.
In order to avoid asymmetric compression (i.e., two SIP entities
exchanging compressed requests in one direction and uncompressed
...
... times out without having received any response, the client SHOULD
retry the same request without using compression. If the compressed
request was sent over a TCP connection, the client ...
... parameters described above.
The compression URI parameter is a "uri-parameter", as defined by the
...
...
P1 forwards the INVITE (2) to P2. P1 does not use compression by
default, so it sends the INVITE uncompressed to P2.
...
... P2 forwards the INVITE (3) to the UAS. P2 supports compression, but
it does not use it by default. Therefore, it sends the INVITE
...
... IANA at
http://www.iana.org/assignments/sip-parameters when new signalling
compression schemes are published in standards track RFCs. The IANA
Considerations section of the RFC MUST include the following
...
... number of the publication.
o Name of the compression scheme.
o Token ...
... registry for the time being is:
Compression scheme Token Reference
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...
... Price, R., Bormann, C., Christoffersson, J., Hannu, H., Liu, Z. and J. Rosenberg, "Signaling Compression (SigComp)", RFC 3320prop, January 2003. ...