[asterisk-ss7] Libss7 Status Update

Matthew Fredrickson creslin at digium.com
Wed Aug 13 10:44:53 CDT 2008

Attila Domjan wrote:
> Hi Matthew,
> I looked into docs/sorcecode and I have some questions about libss7.
> Is it support (ITU):
> - signalling link inhibition/uninhibition Q.782 7.1.1, 7.1.2, 7.2.1,
> 7.2.2, 7.6.1

I've never used a link where we've had to use that, so right now no.  If 
you have an environment where you need that, I think it would be quite 
easy to implement (just a few minutes, IMHO).

> - dual seizure handling Q.784 2.1.1, 2.1.2

Q.784 2.1.1 and 2.1.2 are related to bidirectional audio connectivity 
testing, from what I see, not dual seizure handling.  So in answer to 
that, we do support bidirectional audio handling as well as the 
continuity tests that are used to test it.

Dual seizure handling is something that has to be done at the 
application level (within chan_dahdi).  Right now, we do not do a retry 
on a new circuit automatically in a dual seizure situation.

This is an area where improvement can definitely be made.  However, most 
people that are using it use hunting techniques which minimize or 
eliminate dual seizure scenarios.

Matthew Fredrickson

> Regards,
> Attila Domjan
> On Tue, 2008-08-12 at 12:37 -0500, Matthew Fredrickson wrote:
>> Hey all,
>> It's that time again, time for a news/status update for what's going on 
>> with libss7.
>> 1.0.0 Release:
>> ==============
>> First of all, to let everyone know, we had a 1.0.0 release of libss7 a 
>> few weeks ago (and recently a 1.0.1 as well), so that's a good thing.  I 
>> also would like to thank all of you that have had issues that have come 
>> to me with them.  Because of one person on this list in particular, I 
>> think we have eliminating all the remaining critical bugs in libss7 that 
>> were causing crash related problems (under particular circumstances).
>> Astricon 2008:
>> ==============
>> For all of you that did not see my post about it earlier, I would love 
>> to see as many of you as can show up at Astricon this year (end of 
>> September).  Like I mentioned, I'm going to be giving a talk about 
>> Asterisk and SS7.  I'm planning on discussing basic configuration setup, 
>> common configuration problems that people run into and debugging 
>> techniques which can be used, as well as advanced topics such as the 
>> current "state of the art" with where libss7 is and some potential 
>> directions for future development with Asterisk and SS7.
>> Also, I would like to (if there is enough interest) try to get together 
>> with some of you sometime that week to talk about the status of Asterisk 
>> and SS7 and what kinds of things that we can improve upon and work on in 
>> the future.
>> Confidence Boosters:
>> ====================
>> There are some very good and very interesting things that have been 
>> happening.  If any of you know Joseph on this list, he works for a 
>> mobile phone company in Kentucky.  He is using Asterisk with libss7 to 
>> provide voicemail services to his mobile subscribers.
>> He has quite a good setup for helping me find issues, and is also a good 
>> indicator for how well libss7 is doing stability and scalability wise. 
>> Well the news is that running a current version of libss7/Asterisk-1.6.0 
>> branch he has been running a load over 100,000 calls per day for close 
>> to a month, with no link related stability problems and no Asterisk issues.
>> I have heard much positive feedback from many of you about the more 
>> recent versions of libss7/Asterisk-1.6.0.  If there are any of you out 
>> there with a setup that you would like to share about (especially if you 
>> think your setup is unusual in any way, whether it be high number of 
>> T1/E1s or high volume of call traffic) I personally would be very 
>> interested in hearing about them, publicly or privately if you do not 
>> feel you can disclose it to the list.
>> New Features and Changes:
>> =========================
>> - Aside from the few outstanding bugs that were fixed, there is not much 
>> to talk about.  We are getting quite a robust set of supported messages 
>> and parameters, which is making this section less prone to change. :-)
>> As always, any of you have any questions or concern, please let me know. 
>>   You can get in contact with me with my contact information below.
>> ---
>> Matthew Fredrickson
>> Software/Firmware Engineer
>> Digium, Inc.
>> AIM MatthewFredricks
>> MSN creslin287 at hotmail.com
>> IRC Cresl1n on irc.freenode.net (though I'm on less often than I used to be)
>> Jabber: creslin at digium.com
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