Implementers Guide- pls review
jim.toga at INTEL.COM
Mon Feb 8 12:17:20 EST 1999
My comments below... (I'm cc' this sg16 list so that others will understand
'tweaks' from what had been posted previously)
At 12:18 PM 2/8/99 -0000, you wrote:
>I've drawn up a list of proposals for the implementer's guide, which I was
>planning to put in as my own contribution. It can remain as a separate
>contribution for the meeting, or some or all of it can be subsumed into
>yours, as you see fit. I've attached it to this mail. Specific comments:
>1. Your reworking of the UDP Port usage question appears to be
>self-inconsistent and talks round the fundamental problem rather than fixing
>it (it both sanctions and forbids the use of port 1718 for unicast LRQ).
>The essential problem is that the usage of port 1718 is NOT directly related
>to the discovery issue. I believe my solution is clearer as well as
>requiring less in the way of changes in H.225.0.
I thought the fundamental problem was that a receiving GK had no reliable
way to detect whether a message had arrived via multicast or unicast. My
thinking was that the multicastaddress:1718 VS the localaddress:1718, would
be enough of a differentiator. In any case port 1719 was always relegated
I see your point, but I believe we cannot arbitrarily make unicast on port
1718 'illegal.' It is tighter ( and therefor not backward compatible)
with current v1 and v2 specs. I also do not know the the impact would be
on existing products. I guess I would be more comfortable with a (strong)
_should_ with respect to multi-cast only on port 1718. This by the way is
why there is _should_ statement in the new existing text that I sent out.
I will make these changes and see if they are acceptable by others.
>2. I've drawn something up on the multiple aliases question. I think
>something ought to be agreed and put into the guide asap - and I think this
>will only happen by being presented to a meeting and argued over. I'm happy
>for this, as something a bit controversial, to be kept as my separate
>contribution, but I'd like to think there was some chance of getting it into
>the guide at this cut in some form or other.
I am in favor of resloving this during the meeting.
>I'll put in my contribution, containing whatever you leave me, first thing
>in MY morning tomorrow (ie the middle of tonight your time).
>Dr Chris Purvis - Senior Development Engineer, WAVE CC Software
>Madge Networks Ltd, Wexham Springs, Framewood Road, Wexham, Berks. ENGLAND
>Phone: +44 1753 661 359 email: cpurvis at madge.com
+1-503-264-8816(voice) Intel - Hillsboro, OR
mailto:jim.toga at intel.com mailto:james.toga at ties.itu.int
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