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LTE: How P-CSCF select S-CSCF to send SIP invite request receives from UE ?

+2 votes
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LTE: How P-CSCF select S-CSCF to send SIP invite request receives from UE ?
posted Feb 25, 2017 by Vikram Singh

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+2 votes

I know the fact P-CSCF establishes an IP sec tunnel with the UE but exact at which point it does not sure.

+1 vote

As we know, when a session is established between two user agents i.e. UAC (User Agent Client) and UAS (User Agent Server), known as Dialog in SIP terminology. I read that a SIP user agent client can trigger INVITE message towards user agent server in an already established session. This scenario is known as "re-invite" but I am unable to think the case in which it happens.

0 votes

While going through rfc 3665 , I stopped where proxy server was sending 407 to originator of INVITE request message.
I want to know in what cases/scenarios, proxy server does this.

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