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Back to Table of Contents

Back to IP Multimedia Subsystem (IMS)

Back to SBC as P-CSCF

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Default PUI procedures enable the

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acting as P-CSCF to create an asserted-identity (contained in the P-Asserted-Identity header field) within IP Multimedia Core Network Subsystem for any UE originated initial request for a dialog or request for a stand-alone transaction.

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  • The
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    inserts P-Asserted-Identity in the forwarded SIP message with the contents of matching P-Associated-URI.

 

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The
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include an alternative identity for all request types, including emergency requests. To generate the alternative address, the first two P-Preferred-Identity headers are examined. If both of these headers match a stored P-Associated-Id, the
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generates two P-Asserted-Id headers in the outgoing request. If an alternative Id for an emergency request is not identified, and if the first P-Asserted-Id header added contains a SIP URI, the first Tel URI from the list of implicitly registered public user identities is used to create the alternative identity, and vice versa.
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Procedures related to supporting a privileged sender presenting a custom calling identity not linked to P-Associated-URI sent by the S-CSCF are not supported in the current release.

Since S-CSCF uses the P-Asserted-Identity header field when checking whether the UE originating request matches the initial filter criteria, the P-Preferred-Identity header field inserted by the UE determines which services and applications are invoked.

Default PUI behavior is configurable with enableDefaultPUIProcedures flag from the IP Signaling Profile. Default value is “disabled”. For an SBC acting as a P-CSCF, this flag should be enabled in the IP Signaling Profile assigned to the egress trunk group (towards IMS core).

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% set profiles signaling ipSignalingProfile DFL_PCSCF_CORE_TG_PROF commonIpAttributes flags enableDefaultPUIProcedures enabled
% set addressContext default zone ZONE_AS sipTrunkGroup TG_PCSCF_EXT_IP policy signaling ipSignalingProfile DFL_PCSCF_CORE_TG_PROF
% commit
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For configuration details, seerefer to:

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