[asterisk-ss7] libss7: SLS in MTP3 link

[Kaloyan Kovachev]

On Tue, 25 May 2010 23:48:05 -0300, Horacio J. [UTF-8?]PeГ±a wrote
> Patch attached.
> 

FYI the messages should be TRA, TFA, TFP and TFR. This was addressed in
https://observer.router.hu/repos_pub/libss7/accept_any_sls_tfp_tfa patch

more info can be found in the thread named 'MATTF libss7'
http://lists.digium.com/pipermail/asterisk-ss7/2009-November/thread.html

> On Tue, May 25, 2010 at 11:24:16PM -0300, Horacio J. [UTF-8?]PeГ±a 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. [UTF-8?]PeГ±a 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. [UTF-8?]PeГ±a
> > > horape at compendium.com.ar
> > > horape at uninet.edu
> > 
> > -- 
> > Horacio J. [UTF-8?]PeГ±a
> > horape at compendium.com.ar
> > horape at uninet.edu
> > 
> > -- 
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> -- 
> Horacio J. [UTF-8?]PeГ±a
> horape at compendium.com.ar
> horape at uninet.edu