RE: draft-ietf-mmusic-sip-session-timer-00.txt
John Hearty <John.H.Hearty@mci.com> Thu, 11 February 1999 21:56 UTC
Return-Path: <owner-confctrl>
Received: (from majordom@localhost) by zephyr.isi.edu (8.8.7/8.8.6) id NAA20943 for confctrl-outgoing; Thu, 11 Feb 1999 13:56:58 -0800 (PST)
Received: from tnt.isi.edu (tnt.isi.edu [128.9.128.128]) by zephyr.isi.edu (8.8.7/8.8.6) with ESMTP id NAA20938 for <confctrl@zephyr.isi.edu>; Thu, 11 Feb 1999 13:56:56 -0800 (PST)
Received: from ndcrelay.mcit.com (ndcrelay.mcit.com [166.37.172.49]) by tnt.isi.edu (8.8.7/8.8.6) with ESMTP id NAA23753 for <confctrl@ISI.EDU>; Thu, 11 Feb 1999 13:56:55 -0800 (PST)
Received: from omta1.mcit.com (omta1.mcit.com [166.37.204.2]) by ndcrelay.mcit.com (8.8.7/) with ESMTP id VAA26989; Thu, 11 Feb 1999 21:55:57 GMT
Received: from localHost ([166.35.151.149]) by omta1.mcit.com (InterMail v03.02.05 118 121 101) with SMTP id <19990211215608.KKFZ16328@localHost>; Thu, 11 Feb 1999 15:56:08 -0600
Date: Thu, 11 Feb 1999 15:55:00 -0600
From: John Hearty <John.H.Hearty@mci.com>
X-Mailer: MailRoom for Internet v2.3g (www.SierraSol.com)
To: Pat.Calhoun@Eng.Sun.COM
CC: "Donovan, Steven R. (MCI)" <Steven.R.Donovan@mci.com>, "'iptel@lists.research.bell-labs.com'" <iptel@lists.research.bell-labs.com>, "'confctrl@ISI.EDU'" <confctrl@ISI.EDU>
Subject: RE: draft-ietf-mmusic-sip-session-timer-00.txt
Message-Id: <19990211215608.KKFZ16328@localHost>
Sender: owner-confctrl@zephyr.isi.edu
Precedence: bulk
This draft was written in part to address a concern that stateful SIP proxy servers could have sessions marked active when in fact they have been terminated, and invalid state data could remain indefinately in the server. It is true that BYE messages could be ignored, but that would have to be coordinated by all parties wishing to remain in the session, and then they are just using the IP access pipe they are already paying for. You could even go one step further in that line of thinking and have the originator send a Cancel instead of an ACK once it got the session info back from the terminator in a 200 OK, thereby never starting the session, but coordination from both ends would again be required. So other than setting up the session (which could be a billable event), coordination of the session from that point on would be up to the involved clients, no different than what is now available. John Hearty MCI Worldcom Global Network Evolution Date: Thu, 11 Feb 1999 13:02 -0600 (CST) From: Pat.Calhoun@Eng.Sun.COM (Patrice Calhoun) To: "Donovan, Steven R. (MCI)" <Steven.R.Donovan@mci.com>, "'iptel@lists.research.bell-labs.com'" <iptel@lists.research.bell-labs.com>, "'confctrl@ISI.EDU'" <confctrl@ISI.EDU> Sender: owner-iptel@lists.research.bell-labs.com Reply-to: Pat.Calhoun@Eng.Sun.COM Delivered-to: iptel-outgoing-local@paperless.dnrc.bell-labs.com Delivered-to: iptel-local@paperless.dnrc.bell-labs.com Subject: RE: draft-ietf-mmusic-sip-session-timer-00.txt Pardon the perhaps very naive question, but I suppose I am not as versant in SIP as I would like to be. My understanding is that a SIP Client issues an Invite message to a SIP Server, which in turn forwards the request to a target SIP Client (or some GW or some sort). Once the ACK has returned to the originating client, I was under the impression that both SIP Clients send RTP packets directly to each other, bypassing the SIP Server (this is where I am unclear). So if this is true, how will a SIP Server (stateful, or stateless) enforce any session timeouts? A malicious SIP Client can simply keep the session active for as long as it wishes, ignoring any messages from the SIP Server that may tell it to disconnect. This, as far as I can see, could cause some serious problems if one wishes to deploy a service and still maintain some control over the sessions. Again, perhaps I am way off here. Any clarifications would certainly be appreciated. PatC >This time with the draft attached. Sorry for the extra mail. > >Steve > > <<draft-ietf-mmusic-sip-session-timer-00.txt>> > >> -----Original Message----- >> From: Donovan, Steven R. (MCI) >> Sent: Thursday, February 11, 1999 10:17 AM >> To: 'confctrl@ISI.EDU'; 'iptel@lists.research.bell-labs.com' >> Subject: draft-ietf-mmusic-sip-session-timer-00.txt >> >> This message is notification of the following Internet Draft which has >> been submitted to the IETF for posting. >> >> <draft-ietf-mmusic-sip-session-timer-00.txt> >> >> Abstract: >> >> This document proposes an extension to the SIP specification. This >> extension adds a new message header that is used to specify the >> duration of a requested session. >> >> The session timer can be used to limit the total duration of a session >> if, for instance, one of the participants in the session wants to >> limit the cost of the session. It can also be used by stateful SIP >> Proxy Servers to track the status of sessions for which session state >> exists on the servers. Currently a stateful SIP Proxy Server that is >> not handling the media stream(s) for the session has no mechanism to >> definitively determine the state of all sessions for which it has state. >> While the SIP Specification does provide the BYE method for terminating >> the session, there is no mechanism for a SIP Proxy Server to detect the >> end of a session when the BYE message is not sent or is lost due to >> network problems. >> >> The internet draft is attached. >> >> Steve Donovan >> MCIWorldcom --------- This message came from the IETF IPTEL Working Group Mailing List.
- draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: draft-ietf-mmusic-sip-session-timer-00.txt John Hearty
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Douglas Clowes
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Francois Menard Distribution List Management Account
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Douglas Clowes
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Douglas Clowes
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Henning Schulzrinne
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Francois Menard Distribution List Management Account
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Vipin Palawat
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: RE: draft-ietf-mmusic-sip-session-timer-00.txt Francois Menard
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: RE: draft-ietf-mmusic-sip-session-timer-00.txt Sean Olson
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Dean Willis
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Douglas Clowes
- RE: RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Donovan, Steven R. (MCI)
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Dean Willis
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Douglas Clowes
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Jerome Privat
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Patrice Calhoun
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- Re: draft-ietf-mmusic-sip-session-timer-00.txt John Hearty
- Re: draft-ietf-mmusic-sip-session-timer-00.txt John Hearty
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Lewis McCarthy
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Dean Willis
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Dean Willis
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Jonathan Rosenberg
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Aishling
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Henning Schulzrinne
- RE: draft-ietf-mmusic-sip-session-timer-00.txt Dean Willis
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Mark Handley
- Re: draft-ietf-mmusic-sip-session-timer-00.txt Henning Schulzrinne
- clients and servers Scott Petrack