Subject: [Sip] Multicasting in SIP

From: "Oleksandr Sakada" <[email-masked]>
Date: Mon, 22 Sep 2003 16:55:38 +0300

Hi!

I am confused a little bit with a multicast support in SIP. Consider, we need to establish a multiparty conference with the use of
SIP. If I understand right, we need to have a central mixing unit, having it's own IP address. This address is carried in SDP
encoded body of the INVITE request or 200 OK responce.

If it is correct, what is the role of "maddr" parameter of the Via header field. Do we need to use this parameter as well? Does this
parameter contain the same (multicast) address?

Can you clarify this point, please? Thank you!!!

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