[Asterisk-biz] Looking for SS7 design input

[Race Vanderdecken]

Thank you William,

I am looking at openSS7 for advice. The asterisk project there stalled a
few years ago.

I have also contacted the SS7box project and they have offered advice
and support. SS7Box has a very detailed illustration of SS7 and how it
works. They are more interested in the SS7 side of the equation and have
extensive SS7 experience. SS7box would like to see SS7 and asterisk
holding hands.

>From what I have found the ISUP and Q.931 are the pieces to concentrate
on.

Like I stated earlier this will be much easier to do with an extended
design period so please feel free to comment to the list or directly to
me.

Please remember that while VoIP direct to PSTN interfaces are becoming
more common in the US, E1 & C7 is very popular in Europe.

And yes, there are commercial products you can buy from Cisco and
Tekelec that might make more economic sense, but innovation does not
come from complacency. Besides it might be cool in a geek way.


Race "the Tyrant" Vanderdecken


-----Original Message-----
From: asterisk-biz-bounces at lists.digium.com
[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of William
Waites
Sent: Wednesday, March 30, 2005 11:30 AM
To: Commercial and Business-Oriented Asterisk Discussion
Subject: Re: [Asterisk-biz] Looking for SS7 design input

On Wed, Mar 30, 2005 at 10:45:54AM -0500, Race Vanderdecken wrote:
>  
> Greetings All,
>  
>       I am looking for input on what an SS7 interface to Asterisk
should
> look like and what it will need to be of any use.

Hi,

I would favour an approach that was not tightly coupled to Asterisk.
It would involve improving the Asterisk SIP channel to support SIP-T,
and at that point what you want is an SS7 <---> SIP-T translator, which
is also independently useable.

Often you will have a separate T1 that would be used only for
signalling,
and that could even be handled by a Digium card, but the software to
control
this T1 needn't be Asterisk, though you might look to Asterisk as
documentation
on how to get bits in and out of the hardware. 

Remember that you can use a single T1 to carry signalling for many DS3s
worth of telephone calls, so there isn't that much need to have the STP
be the same box as the media gateway.

For the SS7 stack itself, you might look at OpenSS7, which I am sure you
must have already found... Even though it uses SysV streams...

-w
-- 
William Waites, Consulting Technologist
Consultants Ars Informatica S.A.R.F.
ww at magicphone.ca / +1 416 848 1527 x514
                   +1 514 963 4096 (Direct)
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