Concern on the M3UA SSNM request, DUPU.

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Hi All,

I was referring the rfc4666 <https://tools.ietf.org/html/rfc4666> for M3UA
and have few concerns regarding the DUPU SSNM message.
The specification says that a DUPU indicates the unavailability of a
certain user part.

If I may quote;
" The DUPU message is used by an SGP to inform concerned ASPs that a

 remote peer MTP3-User Part (e.g., ISUP or SCCP) at an SS7 node is
 unavailable"


I have two questions.
1.  How these concerned ASPs are identified.
     Is it upon receiving a MTP-Transfer for a particular user part (say
SCCP) or can it      be sent periodically for a given ASP ?

2. I couldn't find any SSNM message that indicates a User Part's
 Availability. Am I wrong here to expect such a message and if so how come
a concerned ASP know if a     certain User Part is available at a given
point code.

It would be an immense help if anyone could clarify the aforementioned
concerns.

Thanks and Regards,

-- 
Prabath Weerasinghe

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<div dir=3D"ltr"><font face=3D"arial, helvetica, sans-serif">Hi All,</font>=
<div><font face=3D"arial, helvetica, sans-serif"><br></font></div><div><fon=
t face=3D"arial, helvetica, sans-serif">I was referring the=C2=A0<a href=3D=
"https://tools.ietf.org/html/rfc4666">rfc4666</a>=C2=A0for M3UA and have fe=
w concerns regarding the DUPU SSNM message.=C2=A0</font></div><div><font fa=
ce=3D"arial, helvetica, sans-serif">The specification says that a DUPU indi=
cates the=C2=A0unavailability=C2=A0of a certain user part.</font></div><div=
><font face=3D"arial, helvetica, sans-serif"><br></font></div><div><font fa=
ce=3D"arial, helvetica, sans-serif">If I may quote;</font></div><div><font =
face=3D"arial, helvetica, sans-serif" style=3D"background-color:rgb(204,204=
,204)">&quot;=C2=A0<span style=3D"color:rgb(0,0,0)">The DUPU message is use=
d by an SGP to inform concerned ASPs that a</span></font></div><pre class=
=3D"" style=3D"margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><font fac=
e=3D"arial, helvetica, sans-serif" style=3D"background-color:rgb(204,204,20=
4)"> remote peer MTP3-User Part (e.g., ISUP or SCCP) at an SS7 node is
 unavailable&quot;</font></pre><div><br></div><div>I have two questions.</d=
iv><div>1.=C2=A0 How these concerned ASPs are identified.=C2=A0</div><div>=
=C2=A0 =C2=A0 =C2=A0Is it upon receiving a MTP-Transfer for a particular us=
er part (say SCCP) or can it =C2=A0 =C2=A0 =C2=A0be sent periodically for a=
 given ASP ?</div><div><br></div><div>2. I couldn&#39;t find any SSNM messa=
ge that indicates a User Part&#39;s =C2=A0Availability. Am I wrong here to =
expect such a message and if so how come a concerned ASP know if a =C2=A0 =
=C2=A0 certain User Part is available at a given point code.</div><div><br>=
</div><div>It would be an immense help if anyone could clarify the aforemen=
tioned concerns.</div><div><br></div><div>Thanks and Regards,<br clear=3D"a=
ll"><div><br></div>-- <br><div class=3D"gmail_signature" data-smartmail=3D"=
gmail_signature"><div><font color=3D"#666666">Prabath Weerasinghe</font></d=
iv><div><font color=3D"#666666"><span style=3D"font-family:arial,sans-serif=
;line-height:15px"><br>____________________________________________________=
_____________________________<br></span></font><font color=3D"Gray" face=3D=
"Verdana">Confidentiality and Disclaimer<br>
<br>
This email and any attachments are intended only for the person or=20
entity to whom it is addressed. Its contents may be privileged,=20
confidential or otherwise protected from disclosure. If you are not the=20
intended recipient, please do not read, disclose, distribute
 or copy this email or use the information therein or act or omit to act
 in reliance thereof. Please also inform the sender of erroneous receipt
 and delete the material from your system.</font><br></div></div>
</div></div>

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