Subject: Re: Appeal to SIGTRAN WG Chair

From: Mike McGrew <[email-masked]>
Date: Mon, 10 Apr 2000 08:51:54 -0400

just like to add a little detail to this interesting thread...

Actually, "by definition" the signaling gateway is on the edge
of the SS7 cloud.  The SG can have SS7 links to STPs
(in North America "A-links") or handle direct
switch-to-switch signaling links
(in North America "F-links", used to mean "facility associated",
but that thinking is lost in this environment).
It can also support STP-to-STP links
(in North America, "B-links or D-links").

The signaling gateway may have MTP Level 3
(network layer) or may even have only MTP Level 2.
In either case, sigtran (SCTP with the appropriate
adaptation layer; its flexible -- "tunneling" is one of
the options) make it possible to transport
the SS7 MSUs and primitives to the MTP "user"
(e.g., ISUP, SCCP) via IP.
It is still being discussed whether "IP"
includes "the internet" because of performance concerns.

Its more complicated than this, but I think this is
a fair summary at a high level.
Regards,
Mike McGrew
Lucent Technologies
----
On Friday, April 07, 2000 5:47 PM, Bob Wise [SMTP:[email-masked]]
wrote:
> Alternately, the signalling gateway can be attached directly to the
> SS7 cloud (A-link) instead of the switch (F-link). This works best
> in North America, BTW.
>
> -Bob Wise
> Chief Architect
> Vsys
>
>
> -----Original Message-----
> From: Juha Heinanen
> To: [email-masked]
> Sent: 3/30/00 3:46 AM
> Subject: Re: Appeal to SIGTRAN WG Chair
>
> henry,
>
> i'm not a sigtran expert, but i see sigtran important in order to be
> able to place the signaling gateway anywhere on the internet.
> correct me if i'm wrong, but without sigtran, i would need to
integrate the
> signaling gw with the media gw or connect the signaling gw directly
> to telephone switch using a separate physical interface.
>
> so i see sigtran simply as a way to tunnel itu signaling over the
> internet to a properly placed signaling gw, which then turns itu
> signaling to sip and/or mgcp.
>
> -- juha