I think that any work on QoS parameters should be aligned with the work occuring in ETSI Tiphon, ITU SG16, ITU SG11 etc. There's been a considerable amount of effort in trying to come up with common parameters for QoS. Any solution should tap into this.

Cheers, Christian

"Petros N. Mouchtaris" wrote:

Brian,

Actually there was a long discussion on this topic last year on the mailing list i.e. whether MGC should be able to signal an MG which TOS bit to use. The whole topic ended up being dropped. Check the archive for e-mails with title "MG and DiffServ".

By the way, Flemming had volunteered to do some work but I assume it didn't have high enough priority.

Excerpt from e-mail:

"Tom-PT Taylor wrote:

                > You are correct that packages should be drawn up (and/or SDP defined) to
                > allow QOS parameter setting.  Volunteers?

                Sure - I can put a package proposal together.

                -- Flemming

Petros

"Rosen, Brian" Brian.Rosen@marconi.com on 05/08/2001 03:29:44 PM

To: "'Tom-PT Taylor'" taylor@nortelnetworks.com, "'Madhu Babu Brahmanapally'" madhubabu@kenetec.com, "Rosen, Brian" Brian.Rosen@marconi.com, "'Chuong Nguyen'" Chuong.Nguyen@usa.alcatel.com, megaco megaco@fore.com cc: (bcc: Petros N. Mouchtaris/Telcordia) Subject: RE: IP Type of Service

I'll look into this. I agree.

Brian

-----Original Message----- From: Tom-PT Taylor [mailto:taylor@nortelnetworks.com] Sent: Tuesday, May 08, 2001 10:07 AM To: 'Madhu Babu Brahmanapally'; 'Rosen, Brian'; 'Chuong Nguyen'; megaco Subject: RE: IP Type of Service

That makes sense.

-----Original Message----- From: Madhu Babu Brahmanapally [mailto:madhubabu@kenetec.com] Sent: Tuesday, May 08, 2001 10:08 AM To: 'Rosen, Brian'; Taylor, Tom-PT [NORSE:B881:EXCH]; 'Chuong Nguyen'; megaco Subject: RE: IP Type of Service

Hi All, Another suggestion. Why cant the SDP be extended to incorporate a TOS parameter/attribute so that all the protocols(SIP,Megaco,MGCP) that use SDP need not define extra properties/parameter for supporting this.

Regards Madhubabu

-----Original Message----- From: owner-megaco@pit.comms.marconi.com [mailto:owner-megaco@pit.comms.marconi.com]On Behalf Of Rosen, Brian Sent: Tuesday, May 08, 2001 9:24 AM To: 'Madhu Babu Brahmanapally'; 'Tom-PT Taylor'; 'Chuong Nguyen'; megaco@fore.com Subject: RE: IP Type of Service

I don't agree. The TOS for a particular stream should be set on that stream, not on the MG as a whole. For example, if I have a multimedia MG, I will want to set the priority of voice higher than video, and video higher than normal. If I implement a Multilevel Pre-emption and Priority scheme, some calls will have higher priority than others. The TOS/frame priority has to be per stream.

Brian

-----Original Message----- From: Madhu Babu Brahmanapally [mailto:madhubabu@kenetec.com] Sent: Tuesday, May 08, 2001 9:24 AM To: 'Rosen, Brian'; 'Tom-PT Taylor'; 'Chuong Nguyen'; megaco@fore.com Subject: RE: IP Type of Service

Hi All,

The default TOS type should be defined on the ROOT termination for the default TOS used for all media packets generated from the MG. There should be a method (might be through some property) of specifying stream level TOS bits.

I'm interested to work on RSVP.

Regards Madhubabu

-----Original Message----- From: owner-megaco@pit.comms.marconi.com [mailto:owner-megaco@pit.comms.marconi.com]On Behalf Of Rosen, Brian Sent: Tuesday, May 08, 2001 8:10 AM To: 'Tom-PT Taylor'; 'Chuong Nguyen'; 'megaco@fore.com' Subject: RE: IP Type of Service

TOS should not be ignored at the edge router if the router is configured to enable DiffServ.

It would be pretty simple to create one package that had the appropriate controls for DiffServ and 802.1p. RSVP needs it's own package because there is messaging, and you at least an event or two

The former could be an enumeration: QosMarking, that had values None, TOS and FramePriority, plus another integer, Value. That would suffice I think, although you could conceivably get more clever with DiffServ.

Shall I write something up along those lines?

RSVP takes some more work. Any volunteers?

Brian

-----Original Message----- From: Tom-PT Taylor [mailto:taylor@nortelnetworks.com] Sent: Monday, May 07, 2001 9:15 PM To: 'Chuong Nguyen'; 'megaco@fore.com' Subject: RE: IP Type of Service

No such package has yet been defined.

Various QOS architectures can be imagined. Each would give rise to its own package, since the MGC-MG information flow would differ from one architecture to the next. One question: unless the MG is itself the edge router, won't the ToS be ignored when the media packets reach the latter?

-----Original Message----- From: Chuong Nguyen [mailto:Chuong.Nguyen@usa.alcatel.com] Sent: Monday, May 07, 2001 5:14 PM To: 'megaco@fore.com' Subject: IP Type of Service

All

In MGCP, MGC can specify IP Type of Service to the MG. Do we have an equivalent in Megaco?

Is there or has anyone defined a package for IP Type of Service?

Thanks Chuong

--

Alcatel USA, Inc Internet: Chuong.Nguyen@usa.alcatel.com

1000 Coit Road Plano, Texas 75075 Phone: (972) 519-4613

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