[SIPForum-discussion] What are the uses of P-Preferred-Identity??

[Sakharam Thorat]

Hi ,
It is explained here https://tools.ietf.org/html/rfc5876#page-4.
while reading i found below may be helpful,P-Preferred-Identity header, is the one in which the calling user can indicate one of its publicuser identities. This is the identity that he wants to be used for the call.P-Asserted-Identity header, is the one in which the authorised identity of the user will be transported.So, to explain the use lets consider an example:A UE sends an INVITE to the P-CSCF as follows:INVITE sip:abhishek at network.in SIP/2.0From: "Abhishek" <sip:abhishek at network.in>;tag=12345P-Preferred-Identity: <sip:abhishek at network.in>

Best Regards,Sakharam Thorat.From: psyam545 at gmail.com
Date: Sun, 16 Aug 2015 11:58:11 +0530
To: discussion at sipforum.org
Subject: [SIPForum-discussion] What are the uses of P-Preferred-Identity??

Hi All,
As far I understand, P-Preferred-Identity will be shown as caller display name in callee UI. When SIP already have From header which carriers the caller identity, why is this P-Preferred-Identity header required? Why can't we use From header to show caller display name at callee UI?. Is there any added advantage of this header. Some body please explain. Thanks in advance.
Regards,Pendyala 

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