Re: [MMUSIC] Review of draft-nandakumar-mmusic-sdp-mux-attributes-02: sections 5.22, 5.40, 5.41, 5.42

"Ejzak, Richard P (Richard)" <richard.ejzak@alcatel-lucent.com> Mon, 03 June 2013 19:29 UTC

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From: "Ejzak, Richard P (Richard)" <richard.ejzak@alcatel-lucent.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>, "suhasietf@gmail.com" <suhasietf@gmail.com>, =?iso-8859-1?Q?Ari_Ker=E4nen?= <ari.keranen@ericsson.com>, "Flemming Andreasen (fandreas@cisco.com)" <fandreas@cisco.com>
Thread-Topic: Review of draft-nandakumar-mmusic-sdp-mux-attributes-02: sections 5.22, 5.40, 5.41, 5.42
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Date: Mon, 3 Jun 2013 19:22:33 +0000
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Subject: Re: [MMUSIC] Review of draft-nandakumar-mmusic-sdp-mux-attributes-02: sections 5.22, 5.40, 5.41, 5.42
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Hi Christer,
Thanks for asking me to comment on 5.42.  First of all, I agree with all your other comments.  I would recommend that the category for all the items in 5.42 be listed as "SPECIAL" since more work would need to be done in 3GPP to specify their potential use with BUNDLE.  These attributes are all transport related but not in a way that can be easily captured by the category "TRANSPORT".

There are two typos in the table: "visited realm" should be "visited-realm" and the second occurrence of "omr-m-att" should be "omr-m-bw".

Richard

From: Christer Holmberg [mailto:christer.holmberg@ericsson.com]
Sent: Friday, May 31, 2013 2:33 AM
To: mmusic@ietf.org; suhasietf@gmail.com; Ari Keränen; Flemming Andreasen (fandreas@cisco.com)
Cc: Ejzak, Richard P (Richard)
Subject: Review of draft-nandakumar-mmusic-sdp-mux-attributes-02: sections 5.22, 5.40, 5.41, 5.42

Hi,

I was requested to review the attributes listed in sections 5.22, 5.40, 5.41 and 5.42.

However, first I have a general comment on the document:

For some attributes (e.g. MSRP-CEMA), there is note text saying:

"Not recommended due to legacy interop purposes"

Making such statements is completely outside the scope of the document. The document is about multiplexing, and how/if attributes are affected.

There is also similar note text saying:

"Not recommended due to interop purposes"

Now, for the 3GPP defined attributes you could say "Usage only defined for IMS", or something. But, again, it's not within the scope of this document to recommend against using things.

...unless, of course, there from a multiplexing perspective is a reason to do so, and they should be listed under the NOT RECOMMENDED category:


5.22

  +------------+---------------------------------+---------+----------+
   | Name       | Notes                           | Current | Category |
   +------------+---------------------------------+---------+----------+
   | msrp-cema  |                                 | M       | NORMAL   |
   |            |                                 |         |          |
   |            |                                 |         |          |
   +------------+---------------------------------+---------+----------+


5.40


   +-------------+--------------------------------+---------+----------+

   | Name        | Notes                          | Current | Category |

   +-------------+--------------------------------+---------+----------+

   | g.3gpp.cat  | Usage defined for the IP       | M       | NORMAL   |

   |             | Multimedia Subsystem [ref]     |         |          |

   |             |                                |         |          |

   +-------------+--------------------------------+---------+----------+


5.41


   +-------------+--------------------------------+---------+----------+

   | Name        | Notes                          | Current | Category |

   +-------------+--------------------------------+---------+----------+

   | g.3gpp.crs  | Usage defined for the IP       | M       | NORMAL   |

   |             | Multimedia Subsystem [ref]     |         |          |

   |             |                                |         |          |

   +-------------+--------------------------------+---------+----------+


5.42

This is actually an interesting one, and needs a little more investigation. So, I'll have to come back on that one. It would be good if Richard Ejzak, who is the "architect" behind the attributes, could take a look :)


  +------------------+---------------------------+---------+----------+

   | Name             | Notes                     | Current | Category |

   +------------------+---------------------------+---------+----------+

   | secondary-realm  | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | visited realm    | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-m-cksum      | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-s-cksum      | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-m-att        | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-s-att        | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-s-bw         | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-m-att        | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   | omr-codecs       | Usage defined for the IP  | M       | TBD      |

   |                  | Multimedia Subsystem [ref]|         |          |

   |                  |                           |         |          |

   +------------------+---------------------------+---------+----------+



Regards,

Christer