[SIPForum-discussion] Relationship between Content-Disposition/Content-Type/Content-Language/Content-Encoding???

Karl Tian lingyunxjtu at gmail.com
Fri May 9 02:15:29 UTC 2008

Hello All,

Who can tell me the relationship between Content-Disposition and
Content-Type/Content-Language/Content-Encoding, in fact?

In rfc3261, I know Content-Dispositon is useful for UA/US interpreting the
message body as the extension to Content-Type, but I can't understand some
SIP conformance test case, for example-SIP_CC_TE_CE_V_009:

"Purpose: Ensure that the IUT on receipt of an INVITE request including a
Content-Language header value that it cannot understood and a
Content-Disposition header including a handling set to "optional", includes
in its first 2xx response an initial offer session description."

What's the relationship of Content-Disposition and
Content-Language/Content-Encoding ???

Please help me ...

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