Hi Rardhika,
I agree that we need to register with the gatekeeper, however I extend that to say, the gatekeeper could be at home.
I think that we need to clarify the roles of the HLF, VLF, GKs etc before we can move further forward.
Regards,
..//steve
"Roy, Radhika R, ALARC" wrote:
Hi, Steve:
Your statement appears that you are agreeing with the registration with the GK that is the basic foundation of H.323. (However, your contribution does NOT clearly indicate this.) It is a very good news.
Contributions are there what roles to be performed by the VLF, HLF, and home/visiting/visited/target GK/zone/domain. We like to see where you differ and why, and your suggestions.
Please also see my subsequent emails what we need to be done to extend our model to be consistent with H.323 as well as how we can reconcile all contributions: AT&T, Alcatel, and Ericsson.
Best regards, Radhika R. Roy AT&T
-----Original Message----- From: Stephen Terrill [mailto:stephen.terrill@ericsson.com] Sent: Sunday, April 16, 2000 5:00 AM To: ITU-SG16@MAILBAG.INTEL.COM Subject: Re: Should we Break H.323 Model for Mobility?
Hi Roy,
I feel that this email places more assumptions into the role of the VLF, HLF, visited GK, and home GK than we have agreed upon. Certainly the model that we have proposed hasn´t stopped registration with the gatekeeper.
I think that we need to agree upon the roles of the particular entities befor embarking upon concluding that something breaks the H.323 model.
Regards,
..//steve
"Roy, Radhika R, ALARC" wrote:
Hi, Everyone:
H.323 has some definite architectural notion such as terminal, GK, GW, MCU and(MC, MP). One of the fundamental corner stones is the GK. The H.323 entities (e.g., terminals, GWs) register with the GK. A GK manages a zone with the information of all registered users along with other functions (e.g., bandwidth, resource management, etc).
The "registration" with the GK is the fundamental corner stone of H.323 where an association is made by each user. That is, a GK becomes the basic source to have the information related to each user.
H.323 mobility protocol MUST also follow the same H.323 architectural concept. If this basic notion is not maintained, it breaks the basic foundation of H.323.
It appears that H.323 mobility likes to define additional databases like VLFs and HLFs that will store the information related to the mobile users. These databases are supposed to help the function of a GK in order to
manage
the mobility related information.
If people think that an H.323 will be able to register with a VLF
directly,
does it not mean we are by-passing the basic foundation of H.323 model?
Does
it not opening the entirely a new set of problems in H.323? It will create
a
parallel architecture like GK in H.323 what is not needed at all because solutions have provided that are consistent with H.323 model and there is
no
need to do this. We probably have to do all over again what we have done
for
the GKs and BEs. We inviting unnecessary problems that are yet to imagine where we may end up with. Why do we need to do that if one can do this
using
the consistent H.323 model of GK?
In another situation, we have to go step-by-step. First intra-zone, then inter-zone, and last of all inter-domain. Contributions are there to
address
those problems.
The mobile users that move between cells, those cells are expected
primarily
remain the control of a given GK (in some cases it may be two GKs). These scenarios mostly seem to be intra-zone and inter-zone and may involve a single service provider. Of course, there will also be the calls between
the
two adm domains of two service providers.
More importantly, solutions are inter-dependent. That is, we cannot
address
the problems of inter-zone without knowing the intra-zone. In the same token, we cannot address the inter-domain problems without knowing the inter-zone problem. Contributions are there. Let us proceed accordingly.
Last of all, I am reminding the mess that we have made in Annex G. Now people are hungry to use the more powerful and efficient Annex G messages between the GKs. Contributions were brought to do this, but the proposals had been rejected by a very few. Who is suffering?
Best regards, Radhika R. Roy AT&T