Subject: [Megaco] Remote descriptor question

From: Christer Holmberg <[email-masked]>
Date: Wed, 05 Jun 2002 13:07:36 +0300

Hi,

Assume my MGC wants to initiate a session. It sends down the following
Local descriptor in the ADD request:

Local {
    v=0
    c=IN IP4 $
    m=audio $ 0
}

In the reply the MG sends the following Local Descriptor, indicating its
media receiving capabilities:

Local {
    v=0
    c=IN IP4 123.45.67.89
    m=audio 20000 0
}

Now, according to chapter 7.1.8 the MG shall also return a remote
descriptor, indicating the SENDING capabilities:

Remote {
    v=0
    c=IN IP4 XXXX
    m=audio YYYY 0
}

My question is: HOW does the MG know the values of the remote IP address
(XXXX) and the remote IP port (YYYY)? It will not get them until it has
contacted the remote party, when it will send a MODIFY request to the
MG, including the remote capabilities in a remote descriptor.

Shall the MG use "$" for the address and port?

Regards,

Christer Holmberg
Ericsson Finland

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