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

[Ahmed Naji]

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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