SS7 is what a telco uses to interconnect their switches. SS7 is
*not* for customer access. Telcos take SS7 links and generate PRIs
to customers from their switch. With SS7 you can establish Inter
Machine Trunks (IMTs) to carry your voice traffic between your
switch. If you are a CLEC trying to connect to the PSTN you would
use SS7 to link with the ILEC and IMTs to link with the ILEC End
Office and Access Tandems. ISDN PRI uses a subset of the SS7 ISUP
signalling. SS7 also handles database access for Local Number
Portability (LNP) and CNAM, LIDB and E-911 ALI information.
A single SS7 link set (2 64K channels) can handle an entire switch
worth of traffic, thousands of calls per second.
-Matt
On Aug 26, 2005, at 12:45 PM, Richard Gintz wrote:
Can someone give me an example of the cost/feature differences
between SS& and
PRI ISDN? I just got a PRI line in from XO Communications
(Texas). And how
much differently would Asterisk configurations be using SS7 vs. PRI?
Thanks
To me the reason I'd really like SS7 over PRI ISDN is that I would
really like to get the CPC data on incoming calls which PRI
ISDN cannot
do and thats it in total.
I am not sure what _I_ would do with the CPC information in my
case. It may
be good to know where the call came from so that I can setup more
cost
effective route in the future but Caller ID (number) seems good
enough to
start. So simply converting the SS7 message to a PRI should be
good enough.
If I can pass the caller ID information down to the Voip
Subscribers that
would be the only reason I need it.
What do _you_ use the CPC information for?
I think not many people need SS7 - maybe its not big/available in
the
US? Also normal businesses will get by fine with PRI ISDN
(they don't want/need the CPC switch data).
It is the primary way to interconnect to the ILEC (at least Qwest
in the
Northwest). The cost of lines controlled by SS7 is only a
fraction of PRIs
from Qwest or other providers.
Markku Korpi's driver is not cheap for sure
Yes but it is certainly less money than most hardware solutions I
have seen
out there. (Markku hasn't gotten back to me yet from my first
email to him
so I am not even sure whether I will be able to get it if I want it)
Best of luck! When you are finished I you might want lots of
money for
your non-opensource SS7 software too! :)
I am not a greedy person but of course I wouldn't mind lots of
money (That
is why I am in business). Asterisk has helped us a ton and at
very little
cost. We might be able to give back depending on what it will end up
costing. There is always a consulting / support income
possibility even if
it is open sourced. (I don't want to talk like it is done before
I even
start though)
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Matthew S. Crocker
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Crocker Communications, Inc.
Internet Division
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com
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