RE: Is an xxUA SGP capable of serving multiple SGs

Tolga,

There is no need for the "SGP to inform ASP about which SGs that specific SGP is part of". This is known to the craft
administrator at each end, SGP and ASP.

Let's consider the example in which a single SGP is serving 2 SGs. SG1 represents SS7 network 1 and SG2 represents
network 2.
The ASP wishes to register to receive data only for network 1, i.e. SG1. The craft administrators agree that a value of
'1' in the Network Appearance param will represent network 1.

1. When the ASP sends a REG_REQ msg, it includes the Network Appearance param, and sets it to '1'. This tells the SGP
that the ASP wishes to register to receive data for network 1, i.e. SG1.

2. The SGP approves the registration request and responds with Routing Context 1. Now the ASP and SGP have established
that all communications between them for network 1 will be indicated by routing context 1.

Barry Nagelberg
Adax, Inc.

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Tolga Asveren
Sent: Tuesday, February 07, 2006 2:39 PM
To: [email protected]
Subject: RE: [Sigtran] Is an xxUA SGP capable of serving multiple SGs


If you interpret the situation from protocol point of view, i.e. from
procedures point of view to be honored by both ends of the communication-,
this still is a SGP being part of a single SG. Afterall, what is
asked/discussed is SG/SGP abstractions as defined by the protocol. IMHO, the
rest, e.g. how one handles internally traffic belonging to different
networks, is not part of the protocol.

>From protocol point of view, I don't see how a SGP can be part of multiple
SG. There is no way during ASPAC/ASPAC-ACK exchange for the SGP to inform
ASP about which SGs that specific SGP is part of except the SCTP endpoint
information. Similar comment will apply also when sending messages etc..

    thanks,
    tolga


> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Ilie Glib
> Sent: Tuesday, February 07, 2006 2:19 PM
> To: Barry Nagelberg
> Cc: SIGTRAN
> Subject: Re: [Sigtran] Is an xxUA SGP capable of serving multiple SGs
>
>
> Barry,
>
> I see your point.
>
> According to your view an AS talks to one and only one SG within SGP,
> that is, the AS sees (registers with) just one SG in the SGP and
> cannot see more SGs served by the same SGP.
>
> Have I got it right?
>
> Is it a largely accepted view? I mean, are there SG products that do
> that, since it does not put any additional requirements on the ASPs in
> my view.
>
> Thank you in advance
>
> Ilie
>
>
> On 2/7/06, Barry Nagelberg <[email protected]> wrote:
> > Ilie,
> > Please see replies inline.
> > Barry Nagelberg
> >
> > > -----Original Message-----
> > > From: Ilie Glib [mailto:[email protected]]
> > > Sent: Tuesday, February 07, 2006 1:08 PM
> > > To: Barry Nagelberg
> > > Cc: SIGTRAN
> > > Subject: Re: [Sigtran] Is an xxUA SGP capable of serving multiple SGs
> > >
> > >
> > > Hello Barry,
> > >
> > > I cannot agree with you. Is there a statement like yours in
> the M3UA RFC?
> > [BN] - I don't know. Is there a statement prohibiting it?
> >
> > >
> > > If we take an ASP viewpoint. What would be your answers to the
> > > following questions.
> > >
> > > a) How many SGs can an ASP see behind the SGP?
> > [BN] - No limit.
> >
> > >
> > > b) How would you decide to what SGs a DUNA message applies, when it is
> > > sent from an SGP serving multiple SGs?
> > [BN] - From the Network Appearance parameter. I expect each SG
> to be serving a different network.
> >
> > >
> > > c) SGs can allocate RC values independently, therefore you can have
> > > clashes in RC values. Do you expect that SGPs serving multiple SGs use
> > > different RC value spaces for different SGs?
> > [BN] - Yes. Why not? There is no restriction against it.
> >
> > >
> > > Regards
> > >
> > > Ilie
> > >
> > >
> > > On 2/7/06, Barry Nagelberg <[email protected]> wrote:
> > > > Joe,
> > > >
> > > > 1) Yes, an xUA SGP can serve multiple SGs.
> > > >
> > > > 2) No, there aren't any major differences between M3UA and
> SUA in this respect.
> > > >
> > > > Barry Nagelberg
> > > > Adax, Inc.
> > > >
> > > > -----Original Message-----
> > > > From: [email protected]
[mailto:[email protected]]On Behalf Of Siu Chai Tho
> > > Sent: Tuesday, February 07, 2006 10:48 AM
> > > To: SIGTRAN
> > > Subject: [Sigtran] Is an xxUA SGP capable of serving multiple SGs
> > >
> > >
> > > Hello SIGTRAN Community!
> > >
> > > Clould you please answer the following questions
> > >
> > > 1) Is an xxUA SGP capable of serving multiple SGs?
> > >
> > > 2) Is there any difference between M3UA and SUA in this respect?
> > >
> > > Thank you!
> > > Joe
>
>
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>


--
Ilie

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