ISDN & SS7

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I’m planning to use SGM with Asterisk, it is a commercial product.
What is the different between SGM and libs77 and chan_ss7  ? Should I use SGM ?

________________________________
From: Tzafrir Cohen
To: href=”mailto:asterisk-users@lists.digium.com”>asterisk-users@lists.digium.com
Sent: Tue, October 26, 2010 3:12:21 AM
Subject: Re: [asterisk-users] ISDN & SS7

On Sun, Oct 24, 2010 at 11:33:28AM -0500, Cary Fitch wrote:
> SS7 is an inter-telco system using a separate network for all signaling.
>

>
> You must have an SS7 network connection before anything will work.
>

>
> Then the T1 Spans run 24 64k audio paths.  The SS7 net exchanges the call
> data and connection info between the switches.
>

>
> Asterisk doesn’t support SS7 natively although I believe there are one or
> more add-on vendors.

The vendors of addons such as http://svn.asterisk.org/svn/libss7 and
http://svn.asterisk.org/svn/asterisk/trunk/channels/sig_ss7.c ?