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This header is used by the UA to provide the proxy with a preferred identity it wishes for the proxy to use in the P-ASSERTED-IDENTITY header. The proxy does not have to accept this identity as a legitimate identity but can authenticate the user instead (thereby ignoring this identity and using the identity discovered during authentication instead).
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The value provided must consist of a SIP URI, or a TEL URI. There can be multiple headers, but one must contain a SIP URI and the other must contain a TEL URI. Otherwise, only one header is allowed. This header is removed by the proxy prior to forwarding on through the network.
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The 3GPP introduced this extension for use in IMS networks. In an IMS network, a user database identifying all of the characteristics of a subscription such as permissions, identities, and location is found in the network core. Access to this user database(s) is only granted to a proxy referred to as the serving call session control function (S-CSCF). The user database itself is referred to as the home subscriber server (HSS). The HSS also contains identities for the various services being provided by the operator network. Services are hosted on application servers and therefore must be identified through the use of the same SIP addressing schemes as subscribers. This means the various services will also be identified by URIs. These service identifiers have specific addresses so that the application delivering the service on an application server can be addressed. They also have wildcarded identities that are associated with them as well. When a proxy is handling a request in the IMS, it may become necessary for the proxy to be able to access the user database and learn of the service identities associated with delivering the requested service(s) to a subscriber. Each proxy may need to perform this query, which places unnecessary burdens on the proxies and the user database. In the IMS, for example, a request may be received by the interrogating call session control function (I-CSCF) requiring the I-CSCF to query the user database. After forwarding the request to the S-CSCF, the S-CSCF would also have to perform this query, unless the service identity could be carried forward in the request as part of the SIP request. This requires a new header as well as knowledge of the proper key to access the user database. This header contains the key needed for the proxies to be able to access the user database. No explanation is given as to how the key is acquired or how the header is used at this time, so there is little explanation as to how this works in an IMS environment.
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Like the P-PROFILE-KEY header, this header was introduced by the 3GPP for use in the IMS. The issue to be solved in the IMS is multiple proxies accessing the HSS function. The P-PROFILE-KEY header is used to communicate the access key for the database, while this header is used to provide the URI for the HSS serving the subscriber. When a request is received by an I-CSCF, the I-CSCF must determine which HSS is serving that subscriber. To do this, the I-CSCF queries a subscriber location function (SLF). The SLF identifies the HSS serving a subscriber. Once the I-CSCF receives the address of the HSS serving the subscriber addressed in a received request, the I-CSCF forwards the request to the S-CSCF.
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The S-CSCF must then also determine which HSS is serving the subscriber, and it will also query the SLF to find the HSS. This means that at least two different proxies have accessed the same information for one session. To eliminate this need and to optimize the use of the SLF, the 3GPP has defined this header to be used to provide the S-CSCF the address of the HSS as learned from the SLF. The key for accessing the HSS is provided in the P-PROFILE-KEY header, which is also added to the request. The I-CSCF usually has responsibility for adding these headers as it tries to locate a subscriber. The S-CSCF then does not need to query the SLF for the same information, as it has been provided by the I-CSCF. This information is never sent outside of the network, as this would compromise the security of the network s resources (namely the HSS). For this reason, the header is removed from the request by the S-CSCF prior to routing to the destination. This means that the header is used only between the two proxies: the I-CSCF and the S-CSCF.
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