[asterisk-ss7] SIGTRAN GW based on libss7

Thu Jul 15 12:21:55 CDT 2010

It would run on any OS that is supported by dahdi, but is it available to
anything but Linux? I haven't put it up on the web yet, need to clean up the
code and create a config file.

/Sverker

From: asterisk-ss7-bounces at lists.digium.com
[mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Jan Berger
Sent: den 15 juli 2010 4:32
To: asterisk-ss7 at lists.digium.com
Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7

I assume this run's on Linux only ?

Is your project on the web somewhere?

Jan

> Date: Thu, 15 Jul 2010 15:57:55 +0200
> From: sverker at abrahamsson.com
> To: asterisk-ss7 at lists.digium.com
> Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7
> 
> No, there is no licence conflict as the binaries are not linked together.
> The dialogic stack sit on the other side of the SCTP socket and
> communicate with the signaling gateway over SIGTAN. It's only the
> signaling gateway code itself that has to be released as GPL as it's
> linked to libss7.
> /Sverker
> 
> >
> > Isn't that a license conflict? I assume Dialogic is commercial?
> >
> >
> > Jan
> >
> >
> >
> >
> > From: sverker at abrahamsson.com
> > To: asterisk-ss7 at lists.digium.com
> > Date: Thu, 15 Jul 2010 15:28:43 +0200
> > Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yes, I'm only using the libss7 up to mtp3 level. The plan is to
> > support M2UA as well, and maybe M2PA if the need come up.
> >
> >
> >
> > I currently use Dialogic for SCCP/TCAP/MAP layers but the nice
> > part about this architecture is that it can be combined with more or
less
> > any
> > stack and any card supported by dahdi.
> >
> > /Sverker
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > From: asterisk-ss7-bounces at lists.digium.com
> > [mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Jan Berger
> >
> > Sent: den 15 juli 2010 2:47
> >
> > To: asterisk-ss7 at lists.digium.com
> >
> > Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7
> >
> >
> >
> >
> >
> >
> >
> > I have never seen the value of ISUP over
> > SIGTRAN. CAMEL, INAP, MAP makes more sense, but in that case you should
> > only
> > use mtp3 and avoid the rest of Asterisk for the IN-apps.
> >
> >
> >
> >
> >
> > That is unless you plan an integrated SRP solution.
> >
> >
> >
> >
> >
> >
> >
> > For Asterisk I would consider M2UA because that allows an Asterisk to
> > benefit
> > from the redundancy and failover in M2UA + you could stack a SS7 that
> > run's
> > over several boxes - thought the value is a bit limited.
> >
> >
> >
> >
> >
> > What do you use for SCCP, TCAP and CAMEL/MAP?
> >
> >
> >
> >
> >
> > Jan
> >
> >
> >
> >
> >
> >
> >
> > From: sverker at abrahamsson.com
> >
> > To: asterisk-ss7 at lists.digium.com
> >
> > Date: Thu, 15 Jul 2010 10:17:16 +0200
> >
> > Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7
> >
> >
> >
> > Hi Jan,
> >
> > You are right of course, ISUP needs more than just the signaling
> > to be relevant. My focus is on SCCP as it's MAP and INAP that is most
> > interesting for me.
> >
> >
> >
> > Yes, I use the LGPL M3UA stack.
> >
> > /Sverker
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > From: asterisk-ss7-bounces at lists.digium.com
> > [mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Jan Berger
> >
> > Sent: den 14 juli 2010 3:15
> >
> > To: asterisk-ss7 at lists.digium.com
> >
> > Subject: Re: [asterisk-ss7] SIGTRAN GW based on libss7
> >
> >
> >
> >
> >
> >
> >
> > hi Sverker,
> >
> >
> >
> > Most interesting article.
> >
> >
> >
> > SCCP over M3UA is straight forward, but how would you do ISUP?
> >
> >
> >
> > What I mean is that ISUP contains reference to CIC's and basically is an
> > instruction to connect a voice channel - but what will you use to
actually
> > connect to the voice channel ? Asterisk acting as an AS can be on a
> > different box
> > than the SG, meaning that if you run a proper SG you will need to
connect
> > the
> > voice out from that box as well.
> >
> >
> >
> > Are you using the LGPL M3UA stack?
> >
> >
> >
> > Jan
> >
> >
> >
> >> From: sverker at abrahamsson.com
> >
> >> To: asterisk-ss7 at lists.digium.com
> >
> >> Date: Tue, 13 Jul 2010 20:31:22 +0200
> >
> >> Subject: [asterisk-ss7] SIGTRAN GW based on libss7
> >
> >>
> >
> >> Hello everybody,
> >
> >> Since a while back I've been working on a SIGTRAN signaling gateway
> >> which
> >
> >> use libss7 for MTP2 and MTP3 layers and currently support M3UA on the
IP
> >
> >> side, it needs some more work as still many things are hardcoded for
the
> >
> >> specific application but it is being used in production currently. I'm
> > using
> >
> >> E1 card from Sangoma with wanpipe 3.5.11.4 and dahdi 2.3.0.
> >
> >>
> >
> >> To do that I've modified libss7 1.0.2 to allow SCCP packages to be
> >> passed
> >
> >> from libss7 to the gateway app, as I'm currently using only that
> >> protocol.
> >
> >> I'm now looking into cleaning up the code and making it general
purpose,
> > and
> >
> >> I'm also facing an issue. Some questions and remarks:
> >
> >>
> >
> >> * libss7 contains implementations for MTP2, MTP3 and ISUP. I'd be
> > interested
> >
> >> to support ISUP over the SIGTRAN as well. One way to solve that is that
> > the
> >
> >> lib has a call where the application can register which protocols it's
> >
> >> interested of, i.e. ISUP in that case will be passed on to gw
> >> application
> >
> >> instead of handled by internal implementation
> >
> >>
> >
> >> * in file NEWS-05-30-2008 it is mentioned that part of MTP2 processing
> >> has
> >
> >> been moved to kernel space with a new channel driver in zaptel. Does
> >> that
> >
> >> work with dahdi as well and is there any configuration needed to enable
> > it?
> >
> >> I saw an issue on sending mtp2 packets, they were queued in user space
> >> but
> >
> >> the poll in ss7linktest (that I based my app on) never got enabled for
> >
> >> write. I did a quick fix in mtp3_transmit that after calling mtp2_msu
> >> then
> >
> >> ss7_write is called.
> >
> >>
> >
> >> * as I understand the trunk is not the most up to date but there are
> >
> >> development in other branches. Should I port my changes to trunk or to
> > some
> >
> >> other branch?
> >
> >>
> >
> >> * In trunk there has been some api changes so that ss7linktest doesn't
> >
> >> compile. I did changes to make it compile but I might have
misunderstood
> >
> >> something as it didn't work to run it, the link didn't come up. Is
there
> > any
> >
> >> API docs or working example code to use with trunk (or recommended
> > branch)?
> >
> >> How about merging the branches and make a 2.0 release?
> >
> >>
> >
> >> * I'm currently facing an issue with memory corruption, I get the
> > following
> >
> >> from valgrind:
> >
> >>
> >
> >> ==3591== 4999998 errors in context 2 of 8:
> >
> >> ==3591== Thread 3:
> >
> >> ==3591== Invalid free() / delete / delete[]
> >
> >> ==3591== at 0x400551D: free (vg_replace_malloc.c:325)
> >
> >> ==3591== by 0xC53E2F: mtp2_receive (mtp2.c:403)
> >
> >> ==3591== by 0xC5460B: ss7_read (ss7.c:365)
> >
> >> ==3591== by 0x80493B6: ss7_run (sgw.c:114)
> >
> >> ==3591== by 0xC83831: start_thread (in /lib/libpthread-2.5.so)
> >
> >> ==3591== by 0xBC3E0D: clone (in /lib/libc-2.5.so)
> >
> >> ==3591== Address 0x40c9958 is 0 bytes inside a block of size 520 free'd
> >
> >> ==3591== at 0x400551D: free (vg_replace_malloc.c:325)
> >
> >> ==3591== by 0xC53E2F: mtp2_receive (mtp2.c:403)
> >
> >> ==3591== by 0xC5460B: ss7_read (ss7.c:365)
> >
> >> ==3591== by 0x80493B6: ss7_run (sgw.c:114)
> >
> >> ==3591== by 0xC83831: start_thread (in /lib/libpthread-2.5.so)
> >
> >> ==3591== by 0xBC3E0D: clone (in /lib/libc-2.5.so)
> >
> >> ==3591==
> >
> >> ==3591==
> >
> >> ==3591== 4999998 errors in context 3 of 8:
> >
> >> ==3591== Invalid read of size 4
> >
> >> ==3591== at 0xC53E22: mtp2_receive (mtp2.c:402)
> >
> >> ==3591== by 0xC5460B: ss7_read (ss7.c:365)
> >
> >> ==3591== by 0x80493B6: ss7_run (sgw.c:114)
> >
> >> ==3591== by 0xC83831: start_thread (in /lib/libpthread-2.5.so)
> >
> >> ==3591== by 0xBC3E0D: clone (in /lib/libc-2.5.so)
> >
> >> ==3591== Address 0x40c9b5c is 516 bytes inside a block of size 520
> >> free'd
> >
> >> ==3591== at 0x400551D: free (vg_replace_malloc.c:325)
> >
> >> ==3591== by 0xC53E2F: mtp2_receive (mtp2.c:403)
> >
> >> ==3591== by 0xC5460B: ss7_read (ss7.c:365)
> >
> >> ==3591== by 0x80493B6: ss7_run (sgw.c:114)
> >
> >> ==3591== by 0xC83831: start_thread (in /lib/libpthread-2.5.so)
> >
> >> ==3591== by 0xBC3E0D: clone (in /lib/libc-2.5.so)
> >
> >>
> >
> >> Is this something that has already been addressed in trunk/dev branch?
> >> It
> >
> >> had worked fine for a couple of weeks and then suddenly started to
> >> happen
> >
> >> quite frequently under load.
> >
> >>
> >
> >> * The plan for the signaling gateway is to support M3UA, M2UA and M2PA
> >> as
> >
> >> well as the Dialogic gct api. Naturally it will have to be released
> >> under
> >
> >> GPL since libss7 is.
> >
> >>
> >
> >> Best regards
> >
> >> Sverker
> >
> >>
> >
> >>
> >
> >> --
> >
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> >
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> >
> >
> >
> >
> >
> >
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