[Sip] Question on rfc 3313 : sip extension for media authorization

[hajer ferjani <fer_hajer@yahoo.fr>]

Hi all and thanks for previous help ,

in section 7 of rfc 3313 it is said that "the use of
media authorization makes it possible to control the
usage of network resources". 
Isn't this possible by means of RSVP which carry
enough information to identify flows and resources
being used ?

also, it seems to me that the integration of Qos
admission control with call signaling brings
additional session setup delay and additionnal
messages exchange, since there is exchange of REQ/DEC
messages within the phase of resource reservation by
RSVP (refer to section 6. Examples)and authorization
could by performed at this stage.
Please clarify me. Is there something wrong or missing
with my understanding ?
any help appreciated.

Great thanks and Regards.
Hajer.

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