Subject: [midcom] Query on MIDCOM Architecture and Framework

From: "Venkatesh N" <[email-masked]>
Date: Thu, 12 Dec 2002 19:33:45 +0530

Hi All,
I have a query on MIDCOM Architecture and Framework document
RFC 3303.

In page 19 of this document in explaining
"Timeline flow - Middlebox implementing NAPT Service"

Initially the MIDCOM Agent queries the port bind for MA, 5060.
>>As per my understanding this would return us the Private IP Adress
and port of the SIP phone.

Then in the next step MIDCOM Agent would query the NAT Session
Descriptor for the flow Ea-to-Pa (External IP address to Internal
Private IP Address)
What does this NAT Session Descriptor is all about?
What exactly is this for?

Then again later on it says
                       ++Create NAT Session |              |
      |                 |  descriptors for     |                      |
      |                 |  RTP1, RTCP1; Set    |              |
      |                 |  parent session to   |              |
      |                 |  SIP-ctrl session ++>

Can any one explain this?

Probably I'm not able to distinguish between a Session descriptor
and port bindings that  are created during NAPT operations.

Could anyone please clarify my above queries?

thanks in advance

regards,
Venkatesh N

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