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SIP: When does proxy server initiate authentication/authorization for the received INVITE request ?

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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.

posted Aug 18, 2016 by Neelam

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1 Answer

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The request does not contain the Authorization credentials Proxy requires, so a 407 Proxy Authorization response is sent containing the challenge information.
A new INVITE is then sent containing the correct credentials and the call proceeds.

answer Dec 2, 2016 by Bhushan Patil
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