I've done some SS7 development in the past, using dedicated TX3220 and TX4000 signalling boards from NMS Communications (recentlty aquired by Dialogic). Even with a lot of commercial documentation available, it's horribly complex stuff, especially redundancy. And you need another SS7 switch to test against for interoperability. And SIP trunks are becoming more and more commonly available these days, so one can question if it's worth the effort. Still, I would really like it if someone would try and develop such a feature.
 
Off-topic: If you need SS7 and are willing to pay for it, I can recommend audiocodes mediant gateways. There's a model available with embedded SS7 signalling, provided by Teles. And real cheap too, compared to other SS7 switches.
 

Van: freeswitch-dev-bounces@lists.freeswitch.org [mailto:freeswitch-dev-bounces@lists.freeswitch.org] Namens Shane Burrell
Verzonden: woensdag 28 januari 2009 20:50
Aan: freeswitch-dev@lists.freeswitch.org
Onderwerp: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

Trust me AT&T doesn't have free docs. There are hundreds of ANSI SS7 docs and they put alot of work and money to make sure you can't get them via google search.   Much of it is not in ITU but many ITU switch support ANSI features such as Class 5.  Even with the ITU docs in hand you'll need a large team to get it complete enough for Class 4/5 operations anytime soon.
On Jan 28, 2009, at 2:42 PM, Jan Berger wrote:

Next time try to search if AT&T have a free version of the doc first - you might get a suprice.


Date: Wed, 28 Jan 2009 13:36:02 -0600
From: krice@freeswitch.org
To: freeswitch-dev@lists.freeswitch.org
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

Must be nice ;) 

Here in the states they want you to pay for documentation on cable pinouts and don’t even think about getting documentation for something like TCAP LIDB without giving up your first born and an arm.




From: Jan Berger <janvb@live.com>
Reply-To: "freeswitch-dev@lists.freeswitch.org" <freeswitch-dev@lists.freeswitch.org>
Date: Wed, 28 Jan 2009 20:22:38 +0100
To: <freeswitch-dev@lists.freeswitch.org>
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

I live in Europe - and ITU/ETSI are free :)
 



Date: Wed, 28 Jan 2009 12:37:48 -0600
From: krice@freeswitch.org
To: freeswitch-dev@lists.freeswitch.org
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

That’s the same thing we saw...  Everyone wants SS7 but no one wants to help fund it... And to make matters worse just getting proper documentation for ANSI SS7 is not exactly a cheap endeavor. Unfortunately telecordia and crew still want to charge thousands of dollars for the docs when the ITU decided ages ago to make those available for free... Even then its still a substantial amount of effort to get something working (even if you have active links you can use to help understand whats going on)

K






From: Jan Berger <janvb@live.com>
Reply-To: "freeswitch-dev@lists.freeswitch.org" <freeswitch-dev@lists.freeswitch.org>
Date: Wed, 28 Jan 2009 19:30:15 +0100
To: <freeswitch-dev@lists.freeswitch.org>
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

This is a little like the hen and the egg...
 
No one will support you starting to write a SS7 ++ stack, but once you get going and the first stacks turns up, so will business.
 
Jan






From: mike@jerris.com
To: freeswitch-dev@lists.freeswitch.org
Date: Tue, 27 Jan 2009 15:06:11 -0500
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack


I still see a compelling business case for a foundation supported free open source set of libs for the base protocols, commercially supported by multiple contributors who build higher level applications using the base protocols.  In a situation like this, commercial sponsors can pool resources for certification.  Obviously anyone using a modified version would not be using certified code but the sponsors who pay for certification would still get multiple benefits.

Mike

On Jan 27, 2009, at 2:07 PM, Ken Rice wrote:
I don’t see a non Commercial one getting certification and then getting widely used here in the states... That’s the problem you have to spend tons of time to get them certified... Its not like SIP where they will pretty much take anything and everything unfortunately

K

From: Brian West <brian@freeswitch.org>
Reply-To: "freeswitch-dev@lists.freeswitch.org" <freeswitch-dev@lists.freeswitch.org>
Date: Tue, 27 Jan 2009 12:59:18 -0600
To: "freeswitch-dev@lists.freeswitch.org" <freeswitch-dev@lists.freeswitch.org>
Subject: Re: [Freeswitch-dev] FreeSWITCH SS7 stack

We should have an open source one too thats MPL or BSD ... I don't agree with selling protocols like this commercially.  Guess thats just the Open Source in me wanting that stuff to be free.

/b

On Jan 27, 2009, at 12:27 PM, Ken Rice wrote:
There are things available for this in the commercial space.  One from CometSig.com and one from sangoma.  Nothing at this time in the opensource arena. (OpenSS7 will not be integrated with freeswitch due to licensing issues)

Contact me off list if you are interested in either of the commercial versions I can assist you with these things.

Ken


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