Re: Conceptual doubt between an ASP and SGP
David Laight <[email protected]> Thu, 13 Mar 2014 10:53:03 +0000
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M3UA can=92t itself transfer your messages directly from N1 to N3.
It is worth remembering that M3UA carries the interface between MTP3 and it=
s user parts
(typically ISUP and SCCP) over IP.
IPSP seems a =91bodge=92 that more or less works and allows the userparts (=
at different pointcodes)
to send message to each other.
In your case the SCCP code at node N2 could forward messages that arrive fr=
om N1 onwards
to N3. Whether the SCCP you have can be configured to do that is another ma=
tter.
David
From: Sigtran [mailto:[email protected]] On Behalf Of Ajay Garg
Sent: 13 March 2014 10:05
To: [email protected]; [email protected]
Subject: Re: [Sigtran] Conceptual doubt between an ASP and SGP
Brian,
RFC-2719 seems to be too technical for the use-case we are trying to unders=
tand :)
I would rather present (a simplified version of) our use-case.
*
We have 3 nodes - N1, N2, N3.
*
We need to transfer messages in-between N1 and N3.
*
There is an IPSP-IPSP association each between between N1 <-> N2, and N2 <-=
> N3 (but no IPSP-IPSP association between N1 <-> N3).
*
Also, provisions for GTT are available at each of N1, N2 and N3.
Theoritically/Practically, would the above configuration work? Or is it nec=
essary to have a SGP configured at N2?
Looking forward to clarifications.
Thanks and Regards,
Ajay
On Thu, Mar 13, 2014 at 12:47 PM, Brian F. G. Bidulock <[email protected]=
g<mailto:[email protected]>> wrote:
Ajay,
Please see comments below...
Ajay Garg wrote: (Thu, 13 Mar 2014 11:48:19)
> Hi all.
> I am an absolute newbie in telecom domain, so kindly forgive me if I
> sound incredibly stupid.
> From what I understand, an ASP is a process running on an AS, and a SG=
P
> is a process running on a SG.
Not quite. See RFC 4666 "1.2 Terminology" for a definition of ASP,
AS, SGP and SG.
> Each ASP <-> SGP link is a SCTP connection.
> Also, I understand that SGP is responsible for message-routing, while
> an ASP is merely an end-point for a SCTP connection.
> Given that, are there any extra differences between a ASP and SGP (in
> addition to the routing-capabilities of a SGP)?
> I will be grateful for any pointers/clarifications.
RFC 4666 describes for 124 pages the differences between ASP and SGP.
BTW, it is not an SGP per se that has routing capabilities, but an
SG, where the SG is made up of some SGP, an SS7 stack and a
interworking function.
See also RFC 2719 "Framework Architecture for Signaling Transport"
for a better overview of what's going on.
--brian
--
Brian F. G. Bidulock
[email protected]<mailto:[email protected]>
http://www.openss7.org/
--
Regards,
Ajay
=0D=0A
=0D=
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">M3UA can=92t itself trans=
fer your messages directly from N1 to N3.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">It is worth remembering t=
hat M3UA carries the interface between MTP3 and its user parts<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">(typically ISUP and SCCP)=
over IP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">IPSP seems a =91bodge=92 =
that more or less works and allows the userparts (at different pointcodes)<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">to send message to each o=
ther.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">In your case the SCCP cod=
e at node N2 could forward messages that arrive from N1 onwards<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">to N3. Whether the SCCP y=
ou have can be configured to do that is another matter.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> &=
nbsp; David<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
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0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:"Tahoma","sans-serif"">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma",&qu=
ot;sans-serif""> Sigtran [mailto:[email protected]]
<b>On Behalf Of </b>Ajay Garg<br>
<b>Sent:</b> 13 March 2014 10:05<br>
<b>To:</b> [email protected]; [email protected]<br>
<b>Subject:</b> Re: [Sigtran] Conceptual doubt between an ASP and SGP<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Brian,<o:p></o:p></p>
</div>
<p class=3D"MsoNormal">RFC-2719 seems to be too technical for the use-case =
we are trying to understand :)<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">I would rather presen=
t (a simplified version of) our use-case.<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br>
We have 3 nodes - N1, N2, N3.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">* <br>
We need to transfer messages in-between N1 and N3.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br>
There is an IPSP-IPSP association each between between N1 <-> N2, and=
N2 <-> N3 (but no IPSP-IPSP association between N1 <-> N3).<o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">*<br>
Also, provisions for GTT are available at each of N1, N2 and N3.<br>
<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Theoritically/Practic=
ally, would the above configuration work? Or is it necessary to have a SGP =
configured at N2?<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Looking forward to cl=
arifications.<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks and Regards,<br>
Ajay<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class=3D"MsoNormal">On Thu, Mar 13, 2014 at 12:47 PM, Brian F. G. Bidulo=
ck <<a href=3D"mailto:[email protected]" target=3D"_blank">bidulock@o=
penss7.org</a>> wrote:<o:p></o:p></p>
<p class=3D"MsoNormal">Ajay,<br>
<br>
Please see comments below...<br>
<br>
Ajay Garg wrote: &n=
bsp; (Thu, 13 Mar 2014 11:48:19)<o=
:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">> Hi =
all.<br>
> I am an absolute newbie in telecom domain, so kindly forg=
ive me if I<br>
> sound incredibly stupid.<br>
> From what I understand, an ASP is a process running on an=
AS, and a SGP<br>
> is a process running on a SG.<o:p></o:p></p>
</div>
<p class=3D"MsoNormal">Not quite. See RFC 4666 "1.2 Terminology&=
quot; for a definition of ASP,<br>
AS, SGP and SG.<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
> Each ASP <-> SGP link is a SCTP connection.<br>
> Also, I understand that SGP is responsible for message-ro=
uting, while<br>
> an ASP is merely an end-point for a SCTP connection.<br>
> Given that, are there any extra differences between a ASP=
and SGP (in<br>
> addition to the routing-capabilities of a SGP)?<br>
> I will be grateful for any pointers/clarifications.<o:p><=
/o:p></p>
</div>
<p class=3D"MsoNormal">RFC 4666 describes for 124 pages the differences bet=
ween ASP and SGP.<br>
<br>
BTW, it is not an SGP per se that has routing capabilities, but an<br>
SG, where the SG is made up of some SGP, an SS7 stack and a<br>
interworking function.<br>
<br>
See also RFC 2719 "Framework Architecture for Signaling Transport"=
;<br>
for a better overview of what's going on.<br>
<span style=3D"color:#888888"><br>
<span class=3D"hoenzb">--brian</span><br>
<br>
<span class=3D"hoenzb">--</span><br>
<span class=3D"hoenzb">Brian F. G. Bidulock</span><br>
<span class=3D"hoenzb"><a href=3D"mailto:[email protected]">bidulock@ope=
nss7.org</a></span><br>
<span class=3D"hoenzb"><a href=3D"http://www.openss7.org/" target=3D"_blank=
">http://www.openss7.org/</a></span></span><o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><br>
<br clear=3D"all">
<br>
-- <br>
Regards,<br>
Ajay<o:p></o:p></p>
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