Subject: [Ipsec] SIP signalling in IMS using IPsec

From: siddhartha gandhi <[email-masked]>
Date: Fri, 27 Oct 2006 12:12:35 -0700 (PDT)

Hi guys, 

I am in the process of understanding SIP signalling in IMS. Draft ETSI TS 133.203 (v7.3.0) says that if mechanism is specified as "ipsec-3gpp" then it should be strictly used for manual keying. But according to RFC 3329 we already have "ipsec-man" as a manual keying mechanism. Why cant we use "ipsec-man" as a mechanism with the parameters same as specified fir "ipsec-3gpp". 

Also in draft Draft ETSI TS 133.203 it mentions that only ESP Transport mode should be used in IMS. But in NAT scenario betweeen UE and P-CSCF it mentions the usage of udp encapsulated tunnel mode. 

Any inputs will be highly appreciated. 

cheers, 
siddhartha

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