[openss7] Re: [Megaco] Why separate Signaling Gateway from MGC?

["Patrick Lam" <allmailinglist@yahoo.com>]

Tom:

Thanks to your reply.

You are right.  I didn't think about the sigtran group ..... sorry.

However, I still have questions about why SG cannot be combined with MGC in
one box.

To me, combining them into one box provides cost-performance advantage
(less transportation of the signaling, less possibility of errors, and
cheaper to manufacture).

Am I missing something?

Thanks again in advance,

Patrick.


----- Original Message -----
From: "Tom-PT Taylor" <taylor@nortelnetworks.com>
To: "'Patrick Lam'" <allmailinglist@yahoo.com>; <openss7@openss7.org>
Cc: <megaco@ietf.org>
Sent: Monday, December 10, 2001 9:09 AM
Subject: RE: [Megaco] Why separate Signaling Gateway from MGC?


> The question should have gone to Sigtran rather than Megaco, but I'll
answer
> it.
>
> The SG doesn't actually look at the call signalling: it does a transport
> conversion for the layers beneath it.  Thus MTP3 becomes MxUA/SCTP/IP,
Q.921
> becomes IUA/SCTP/IP, and so on.  The signalling interworking is all done
in
> the MGC.
>
> The other point is that these are functional roles, so vendors are free to
> terminate the original transport directly on the box supporting the MGC
> function where that makes sense.
>
> -----Original Message-----
> From: Patrick Lam [mailto:allmailinglist@yahoo.com]
> Sent: Monday, December 10, 2001 12:12 AM
> To: openss7@openss7.org
> Cc: megaco@ietf.org
> Subject: [Megaco] Why separate Signaling Gateway from MGC?
>
>
> Hi:
>
> I hope these will be the right groups to ask this question ..... :)
>
> I have done some research on SS7 Signaling Gateways and MGCs.  I found an
> interesting similarities among most vendors:  the SG and MGC are usually
> separated into physically differen boxes.  While I understand that the
> scalability of the MGC might be the reason that the SS7 has to be
separated
> from it, but I really want to know why the vendors can't combine the
> functionalities of SG and MGC together into one box?
>
> Why not have the SG decode all the ISUP and do MGCP and H.323 all in one
> box?  What's the advantage of having a SG to convert SS7 to Sigtran, and
> then having MGC convert Sigtran to H.323 and do MGCP?
>
> Thanks very much in advance,
>
> Patrick.
>
> _______________________________________________
> Megaco mailing list
> Megaco@ietf.org
> http://www1.ietf.org/mailman/listinfo/megaco


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