RE: DPC + OPC Routing

Brian,

ANSI SCCP does not support sending UPU for SCCP unavailability or
sending SSTs for SSN=1 (these procedures went in as a draft at one point
in the early 90's and then were deleted).  (Note, ITU SCCP does support
UPU for SCCP unavailability / SSTs/SSAs for SSN=1)

Instead, at an STP, a TFP/TFA regarding the alias PC should be sent (see
ANSI T1.111.4, Section 3.A and 3.B). There are no ANSI procedures, that
I am aware of, for handling SCCP unavailability at an end node. The
assumption was, I believe, that SCCP can't fail independently of MTP
with current end-node implementations. 

Cathy Newman

-----Original Message-----
From: Brian F. G. Bidulock [mailto:[email protected]] 
Sent: Tuesday, April 10, 2007 12:22 AM
To: anjali gurmukhani
Cc: [email protected]
Subject: Re: [Sigtran] DPC + OPC Routing

anjali,

Send UPU(Inaccessible).  If remote user is ISUP, it will start UPT
procedures.
If remove user is SCCP, it will start SST procedures.

--brian

anjali gurmukhani wrote:
(Mon, 09 Apr 2007 20:55:05)
> 
> 
> 
>    Hello Brian and all...
> 
> 
> 
>    I  had one question related to a scenario incase of  DPC + OPC
routing
>    is used in M3UA. Please see the figure below.
> 
> 
> 
>    Consider   that   at  SG(STPB),  there  are  two  Application
servers
>    configured  handling the traffic for the same DPC but originating
from
>    different OPCs
> 
> 
> 
>    AS1 - Rk Type - DPC + OPC - DPC = 0-0-9, OPC = 2-8-221 - ASP1
>    AS2 - Rk Type - DPC + OPC - DPC = 0-0-9, OPC = 2-8-222 - ASP2
> 
>        MSC1(2-8-221)
>              /-----\          STPA        STPB        DPC=0-0-9
>            ||       ||       +---- -+        +----- +
>             |       |--------|       +------- |
>    +--------ASP1(catering traffic for AS1)
>              \-----/        +--+--+        +---+-+
>                                 |               |
>                                 |               |
>                                 |               |
>         MSC2(2-8-222)  |               |
>                 ||------+---------+
+-----------ASP2(catering
>    traffic for AS2)
>               |     |
>                \---/
> 
> 
> 
>    Both AS's have a single ASP catering to them.
> 
> 
> 
>    If   the   ASP  serving  AS1  goes  down,  how  would  (through
which
>    message) STPB  (SG)propagate this to its adjoining STP(STPA) and
hence
>    to  OPC(because  as  such DPC 0-0-9 is still available) , so that
MSC1
>    does not send any messages for ASP1?
> 
> 
> 
> 
> 
>    -Regards
> 
>    Anjali.
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-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/

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