[asterisk-ss7] libss7: SLS in MTP3 link

[Horacio J. Peña]

Patch attached.

On Tue, May 25, 2010 at 11:24:16PM -0300, Horacio J. Peña wrote:
> Looking further, Q.704 2.3.4.1 says:
> 
> Messages not related to a signalling link may be assigned any Signalling
> Link Code (SLC) to allow load sharing of the messages, or may be assigned
> a default SLC such as 0000. They are routed in accordance with the normal
> routing function, where the (SLC) is used as SLS for load sharing.
> 
> Q.704 9.1:
> 
> The MTP restart procedure uses the Traffic Restart Allowed (TRA) message
> which contains:
> – the label, indicating the originating signalling point and the
> adjacent destination signalling point;
> – the traffic restart allowed signal.
> 
> Q.704 15.2:
> 
> The Signalling Link Code (SLC) indicates the signalling link, connecting
> the destination and originating points, to which the message is related.
> If the message is not related to a signalling link, or another particular
> code is not specified, it is coded 0000.
> 
> 
> I am not sure if I understand it correctly, but it seems to me (and to
> the spc 7000's developer) that TRA is not related to a signalling link,
> so SLC may be coded as 0000 and should be accepted.
> 
> 
> mtp.3, net_mng_receive:
> 
> struct mtp2 *winner = slc_to_mtp2(mtp2->master, rl->sls);
> 
> if (!winner) {
>         /* Could not find the given slc */
>         return 0;
> }
> 
> should be changed to something like:
> 
> struct mtp2 *winner = net_mng_uses_sls(*headerptr) ? slc_to_mtp2(mtp2->master, rl->sls) : first_mtp2(mtp2->master);
> 
> (and the corresponding implementation of net_mng_uses_sls and first_mtp2)
> 
> 
> Does this sound ok? What other NET_MNG messages aren't related to a signalling link ?
> 
> Thanks!
> H
> 
> On Tue, May 25, 2010 at 12:32:31PM -0300, Horacio J. Peña wrote:
> > Hola!
> > 
> > I'm having a problem getting a MTP3 link up. I'm not sure what SLC
> > should be used but if I do the ss7_add_link with slc=1, it fails like:
> > (my PC is 5000, adjpc is 7000)
> > 
> > STD_TEST OPC 5000 DPC 7000 SLS 1 H0: 1 H1: 1
> > STD_TEST OPC 7000 DPC 5000 SLS 1 H0: 1 H1: 1
> > STD_TEST OPC 5000 DPC 7000 SLS 1 H0: 1 H1: 2
> > STD_TEST OPC 7000 DPC 5000 SLS 1 H0: 1 H1: 2
> > NET_MNG  OPC 5000 DPC 7000 SLS 1 H0: 7 H1: 1 TRA
> > NET_MNG  OPC 7000 DPC 5000 SLS 0 H0: 7 H1: 1 TRA (not recognized)
> > 
> > And if I use slc=0, it fails like:
> > 
> > STD_TEST OPC 5000 DPC 7000 SLS 0 H0: 1 H1: 1
> > STD_TEST OPC 7000 DPC 5000 SLS 1 H0: 1 H1: 1
> > No siganlling link available sending message!
> > 
> > STD_TEST OPC 7000 DPC 5000 SLS 1 H0: 1 H1: 1
> > No siganlling link available sending message!
> > 
> > Am I missing something?
> > 
> > Thanks!
> > -- 
> > Horacio J. Peña
> > horape at compendium.com.ar
> > horape at uninet.edu
> 
> -- 
> Horacio J. Peña
> horape at compendium.com.ar
> horape at uninet.edu
> 
> -- 
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
> 
> asterisk-ss7 mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-ss7

-- 
Horacio J. Peña
horape at compendium.com.ar
horape at uninet.edu
-------------- next part --------------
A non-text attachment was scrubbed...
Name: net_mng_uses_sls.diff
Type: text/x-diff
Size: 914 bytes
Desc: not available
Url : http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100525/d8610f72/attachment.diff