Re: Conceptual doubt between an ASP and SGP

From: Brian F. G. Bidulock
> Ajay,
> 
> Please see comments below...
> 
> Ajay Garg wrote:                             (Fri, 14 Mar 2014 11:45:20)
> >    I meant that in the scenario all of N1, N2, N3 are pure sigtran-nodes
> >    (i.e. no SS7 nodes in the network), is there any usecase when
> >    transferring messages from N1->N3 in the configuration ::
> >                  * IPSP-IPSP association between N1 <-> N2
> >                  * IPSP-IPSP association between N2 <-> N3
> >                  * GTT at N2
> >    will have ANY different behaviour (from pure end-user point of view)
> >    against the configuration ::
> >                  * ASP-SGP association between N1 <-> N2
> >                  * SGP-ASP association between N2 <-> N3
> >                  * GTT at N2
> 
> Yes, I understand, however, the former scenario is explicitly not
> supported by the M3UA standard (see some clips below).  We explicitly
> only supported IPSP in an end-point to end-point connection with no
> intermediate transfer function due to the lack of a satisfactory
> interworking of SS7 network management functions.
> 
> So, for example, in the AS <-> SG <-> AS configuration, the SG
> provides management messages to the one AS on the availability,
> restriction and congestion state of the routeset toward the other
> AS (not to mention the entire gamut of any necessary rerouting
> and MTP restart procedures).

But once the message arrives at SCCP in N2, the global title translation
tables can indicate that the message needs to be forwarded to N3
(possibly with a re-written GT).

So although the SS7 message doesn't get transferred from N1 to N3
a TCAP request can be forwarded.

	David