Proxies
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... SIP entities
exchanging compressed requests in one direction and uncompressed
requests in the other direction) proxies need to rewrite their
Record-Route entries in the responses. A proxy ...
...
Although proxies usually add zero or one Record-Route entries to a
particular request, some proxies ...
... proxies usually add zero or one Record-Route entries to a
particular request, some proxies add two of them to avoid Record-
Route rewriting. A typical example of double Record-Routing ...
... Record-Route header
field on the response.
Proxies that receive compressed messages from one side of the dialog
(e.g., upstream) and uncompressed messages from the other side (e.g.,
...
... not Record-Route but proxy P2 does. Both proxies support
compression, but they do not use it by default.
...
... Figure 1: INVITE transaction through two proxies
Messages (1), (6) and (7) are compressed (c).
...