[asterisk-ss7] Suggestion for Lowest price PRI provisioning

Matthew Fredrickson creslin at digium.com
Fri Dec 12 15:52:31 CST 2008

Mehdi Shirazi wrote:
> Hi
> I am working in a big telecom operator.
> we have huge amount of ISUP trunks but in some exchanges we don't have 
> enough PRI  Es . I have an ideas for solving this problem in lowest 
> price as below :
> There should be a special signaling convertor like this: this converter 
> receives 2 SS7 signaling channels from telecom switch and convert it to 
> 120 D_channet(PRI) on same TE410 board then inside Telecom switch with 
> configuring "semi permanent connection"
> every D_channel will map to channel 16 of E1s that supposed to work as 
> PRIs so 120 D_channel will map to channel 16 of 120 E1s( from telecom 
> switch point of view this E1s are SS7 trunks ).
> by this method with using just 4 E1 ports we can convert 120 ISUP E1 to 
> PRI and sell them.
> signal convertor box <<--2 ss7 channel---Telecom switch -----120 
> PRI---->ISPs,PABXs
> signal convertor box --120 D_channel-->>Telecom switch 
> ........''.........''............"          
> I want to know is doing this method is possible with Asterisk+ 
> libss7+libpri without modifying source cods ?
> If need modifying source code is it easy or need deep understanding of 
> source codes ?
> what is your suggestion is it practical idea at all or not ?

This is certainly doable and a not uncommon situation.  I think a number 
of people use libss7 for ISDN<->SS7 gatewaying. (In case you didn't get 
my email earlier).

Matthew Fredrickson
Digium, Inc.

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