[asterisk-ss7] Re: Turning up A-Links

Michael Tague tague at AmericanCLEC.com
Fri Feb 2 15:29:29 MST 2007


The thing that I would like to set up is essentially Asterisk as a Media
Gateway Controller (MGC) that understands SS7.  The MGC would then control
Media Gateways such as the Cisco 5400 using MGCP (Media Gateway Control

I know Asterisk has some implementation of MGCP and I thought, perhaps
mistakenly, that via MGCP Asterisk could control a Media Gateway.  I was
hoping that with libss7 Asterisk would then be able to communicate to the
SS7 network and control the Media Gateways.

It sounds like Asterisk can understand SS7 and locally - within the box -
answer and originate calls on trunks plugged directly into the Asterisk box.
But, from your answer, it looks like Asterisk can't then use MGCP to control
another Media Gateway?

Would you have any speculation about just how hard it would be to make it
work?  That is, is it a matter of some relatively simple functionality not
implemented, or have I completely misunderstood the architecture of
everything and making this work would be a huge project.   Any thoughts?


----- Original Message ----- 
From: "Matthew Fredrickson" <creslin at digium.com>
To: <asterisk-ss7 at lists.digium.com>
Sent: Friday, February 02, 2007 4:41 PM
Subject: Re: [asterisk-ss7] Re: Turning up A-Links

> On Feb 2, 2007, at 3:21 PM, Michael Tague wrote:
> > Hi,
> >
> > On this topic of signaling links versus bearer traffic.
> >
> > Is it possible to just use the Asterisk box to bring in the signaling,
> > A-links only, and then via Asterisk MGCP control a media gateway like a
> > Cisco 5400?
> >
> > That is, the SS7 information can be used with MGCP to control bearer
> > traffic
> > that is not actually terminating in the Asterisk box?
> No, Asterisk MGCP does device control, but cannot be the one controlled
> via mgcp.  There also is not any way to make asterisk control an MGCP
> server using SS7 as the signalling protocol since chan_zap and
> chan_mgcp have no way of mapping the CICs to MGCP bearers.
> Matthew Fredrickson
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