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Re: [sipcore] Question about RFC5009

"Avasarala, Ranjit (Nokia - US/Naperville)" <ranjit.avasarala@nokia.com> Fri, 30 September 2022 15:27 UTC

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From: "Avasarala, Ranjit (Nokia - US/Naperville)" <ranjit.avasarala@nokia.com>
To: Birwipfel Robert <Robert.Birwipfel@A1.at>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Question about RFC5009
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Date: Fri, 30 Sep 2022 15:27:07 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sipcore/7O58gcmOMQVZuzpXmOFB6oAkSJY>
Subject: Re: [sipcore] Question about RFC5009
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Hi Robert

The purpose of PEM (P-Early-Media header) is to request and authorize the use of early media in networks that have a policy that prevents or prohibits  the exchange of early media between end users
So if the network in which you are working has no such policy, then u don't need PEM or its becomes redundant.

Regards
Ranjit

From: sipcore <sipcore-bounces@ietf.org> On Behalf Of Birwipfel Robert
Sent: Friday, September 30, 2022 3:40 AM
To: sipcore@ietf.org
Subject: [sipcore] Question about RFC5009

Hi all,

I do have a general question about the RFC5009.

Is the offer/answer (SDP) mandatory to use the PEM header or is it enough to send the offer only, because if I have the offer received I am able to reply with a 18x incl. PEM with sendonly and send RTP.


E.G.:

INVITE (SDP) incl. PEM supported  ->

                                                           <- 183 Session Progress incl. PEM:sendonly

Or is this mandatory

INVITE (SDP) incl. PEM supported  ->

                                                           <- 183 Session Progress (SDP) incl. PEM:sendonly


Thank you!

Best regards
Robert


Ing. Robert Birwipfel
Technology
Signalling & Voice Interconnect

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