[Asterisk-Users] Signalling C7 / SS7

[Tom Scott]

That's the way to go: IMTs (or "SS7 trunks") for the
bearer services and and SS7 for signaling. The cost
benefits alone would make it a valuable project.

The days of the huge end office switch are numbered.
every building and the larger corporations will have
its own softswitch. There's plenty of fiber in
the metropolitan areas that could handle the traffic
outside the LEC loops, and the ability to construct
and maintain scores of SS7-based mini-pops all
over town. What's stopping it? Well, we don't want
to get political on this list so i'll end that line
of thought right now.

I think we'll get there in a year or two. Despite
what our friends at the SS7 groups might have
us believe, Asterisk is a good platform to start
from. The place to check next is at java.sun.com and
nist.gov. Does anyone know if the JAIN APIs have
any interest groups that are working on open-source
Java implementation of SS7, and if any of these
projects are showing up at java.sun.com or Ranga's
group at nist.gov?

I guess the other issue is: What would the programming
interface be between asterisk C and a java
implementation of SS7?

take a look at the IPCC softswitch architecture. it's
modular. What would it take to make open protocols
between the components of asterisk, and to have one of
those components be an SS7 signaling gateway?

Asterisk is the way to do it. Even if we don't have
a total solution, we could at least start a wish list?

-- TT


Bruce Komito wrote:

>We are interested, too, but from a practical standpoint.  We have IMT
>trunks from the LECs, and it would be great to be able to terminate them
>with Asterisk.  That can't happen without SS7 support, so instead we can
>only terminate PRIs, which, of course, requires a switch that supports
>SS7.
>
>Bruce Komito
>High Sierra Networks, Inc.
>www.servers-r-us.com
>(775) 284-5800 ext 115
>
>
>On Mon, 10 May 2004, Tom Scott wrote:
>
>  
>
>>Storer, Darren wrote:
>>
>>    
>>
>>>Hi Roger,
>>>
>>>
>>>
>>>      
>>>
>>>>What hardware do you use to connect your asterisk
>>>>box to a PSTN carrier via C7/SS7 (instead of ISDN PRI)?
>>>>
>>>>
>>>>        
>>>>
>>>There is currently no native SS7 support within Asterisk. If your need is
>>>urgent you could source a protocol converter (PRI/C7) from a 3rd party like
>>>Telesoft (Okeford 4000 etc.) but the costs are prohibitive compared to a
>>>very cost effective Asterisk platform.
>>>
>>>There is an OpenSS7 project (See: http://www.openss7.org/asterix.html ) that
>>>is looking at such a stack for Asterisk but it appears to have stalled. Have
>>>a look in the mailing list archive for more info.
>>>
>>>Out of interest, why do you need SS7 on your Asterisk build? (Which features
>>>etc. are you looking to support?)
>>>
>>>      
>>>
>>I can';t speak for anyone else, but my interest in SS7 is academic.
>>I'd like to include a chapter or two on the "softswitch" movement,
>>where traditional CO/EO switches are replaced by an MGC/MG
>>and related components like an application server, media server
>>and signaling converter/gateway). It would be valuable for students
>>in an Intro to VoIP course to have even just minimal hands-on
>>experience with SS7 messages, the three types of nodes (SSP, STP,
>>SCP), the systems they connect to (traditional CO/EO switches,
>>softswitches and databases), and basic operation of the protocols,
>>especially TCAP, SCCP, and ISUP. If you're interested, see our
>>course notes at:
>>
>>http://vedatel.com/Isdn/voip_ss7_softswitch.html#mozTocId41743
>>
>>-- TT
>>
>>    
>>
>>>Regards
>>>
>>>Darren
>>>--
>>>Telco>Internet<Broadcast
>>>
>>>-----Original Message-----
>>>From: asterisk-users-admin at lists.digium.com
>>>[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Roger
>>>Schreiter
>>>Sent: 10 May 2004 13:48
>>>To: asterisk-users at lists.digium.com
>>>Subject: [Asterisk-Users] Signalling C7 / SS7
>>>
>>>
>>>Hi,
>>>
>>>has anybody out there experience with those
>>>server grade connections?
>>>
>>>What hardware do you use to connect your asterisk
>>>box to a PSTN carrier via C7/SS7 (instead of ISDN PRI)?
>>>
>>>
>>>Thanks for any hints!
>>>Roger Schreiter.
>>>
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>>>
>>>
>>>      
>>>
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