Hello All,
When I read RFC3261, it mentions in section 23.4 SIP Header Privacy and Integrity
using S/MIME: Tunneling SIP ,it says:
"As a means of providing some degree of end-to-end authentication,
integrity or confidentiality for SIP header fields, S/MIME can
encapsulate entire SIP messages within MIME bodies of type
"message/sip" and then apply MIME security to these bodies in the
same manner as typical SIP bodies. These encapsulated SIP requests
and responses do not constitute a separate dialog or transaction,
they are a copy of the "outer" message that is used to verify
~~~~~~~~~~~~~~~???
integrity or to supply additional information.
"
and
" Any traditional MIME bodies (such as SDP) SHOULD be attached to the
"inner" message so that they can also benefit from S/MIME security.
~~~~~~~~~~~~~~~???
Note that "message/sip" bodies can be sent as a part of a MIME
"multipart/mixed" body if any unsecured MIME types should also be
transmitted in a request.
"
Can anybody give me an explanation on "outer message" & "inner message"?
Thanks very much!
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