[Asterisk-Users] Who would use Asterisk SS7?

[Steven Critchfield]

It may be just a difference in my experience, but this article you quote
seems heavily flawed.

It is claiming that the SS7 links would allow you to use a T1 as if it
where a PRI, and the difference in cost between a T1 and a PRI would
save you money in the long run. The numbers they quote are just about
reveresed from the reality I've dealt with over the last year. At least
in TN, I can get a PRI for less than a full deployed T1. Oddly enough it
mostly has to do with taxes, and it seems in TN you pay taxes per line
turned up on the T1, but you get a bulk discount on the PRI. I mention
this being TN as we are known for having screwed the telco in what the
PSC would allow them to charge.

Current quote for a PRI here that we just had turned up today ended up
bing ~$750 a month after taxes and all. Our T1 that we are turning off
is running us ~$950 a month.

Also it falsely claims that callerid can not be transported from PSTN to
VoIP or from VoIP to PSTN. Asterisk does it just fine, and so does some
of the other VoIP providers.

The article seems to only talk about dial up modem users. As soon as
there is maybe 1 or 2 more broadband options available, there will not
be much use for modem connections as the prices should start dropping to
the point of making the dial up only useable for network backwaters. We
aren't there yet, but we will get there faster than ss7 will be usable
for what this article says. 

On Fri, 2003-05-23 at 11:33, Mike M wrote:
> Hello.  I am new to this forum.  If this issue has been discussed already, 
> please inform me, but my STFW have indicated that it has not.
> 
> If SS7 were available on * would it make commercial sense to use it?  There 
> are case studies on the web (courtesy of the Death Star :->) for ISPs with 
> 10,000+ subscriber lines showing clear cost savings in transitioning from PRI 
> to SS7 controlled IMT.  My question is focused on * and its users.  More 
> detail might help.  The discussion below assumes a North American PSTN and US 
> currency.  
> 
> If a * user connects to the PSTN with a PRI it will cost $900/month (in 1998 
> according to [1]).  An equivalent connection with SS7/IMT is $3000/month 
> ($2500 for two SS7 A-links and one or two route sets and $500 for the IMT).  
> The SS7/IMT method becomes a better deal when more than 72 VGC (3 x T1-24ch) 
> are needed.  Are there any * users that use or forsee using 72+ VGC to the 
> PSTN?
> 
> I know in at least one or two markets the monthly cost of 2 A-links is closer 
> to $1800/month.  I cannot verify any of the other costs in the model above, 
> but they seem about right.
> 
> Can anyone provide a similar PRI versus SS7/IMT cost model for any other 
> parts of the world?  
> 
> [1] http://www.tmcnet.com/articles/ctimag/0998/featureBay.htm
> 
> TIA,
-- 
Steven Critchfield  <critch at basesys.com>