[asterisk-ss7] ISUP via Media Gateways: A project and possiblebounty

[Sam Deller - Airnet NZ]

-----Original Message-----
From: asterisk-ss7-bounces at lists.digium.com
[mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Ahmed Naji
Sent: Friday, 12 May 2006 10:15 a.m.
To: asterisk-ss7 at lists.digium.com
Subject: [asterisk-ss7] ISUP via Media Gateways: A project and
possiblebounty

List,

I would like to start a development to fully implement an ISUP channel
for Asterisk using Media Gateways (Cisco AS53xx/54xx for starters) as
the PSTN interface.

I propose implementing F-links by using Asterisk as the CA, and the
Cisco (say AS5350) a the gateway taking in the PRI circuits with bearer
and signalling channel(s). Then, the integrated SLT feature of the
gateway would be used to drop-and-insert the channel(s) carrying
signalling channel(s) and backhaul this utilising SIGTRAN or similar
over to Asterisk.

On the Asterisk side, the channel code would implement the necessary
dual-state-machine needed to map ISUP messages back and forth with VoIP,
and use SIP (initially) as the VoIP side presentation. Little query here
is that whether or not the SIP code within Asterisk can handle 3rd part
call control; if this is the case, then life is much easier: the Cisco
can be controlled as a UA, encapsulating the ISUP messages in SIP
envelops sent over to Asterisk. If this is not possible of feasible,
then how about doing all of this should be doable utilising the MGCP GC
component of Asterisk.

I tired raising this on the asterisk-dev channel, but everyone seemed
more interested in taking the mick and payment by pints of beer thank
talking code. Or is it just me ?

Oh, then there is the bounty: besides putting in the time, dev effort
..etc, I am offering a $5,000 for the first mile-stone, that being an
Asterisk CA controlling a Cisco AS53x/54xx to process ISUP messages
backhauld to the latter over SIGTRAN or similar.

Thanks,

Ahmed Naji
Tech. Director
5G Networks LTD
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