[Asterisk-Users] Who would use Asterisk SS7?

[Mike M]

On Friday 23 May 2003 14:17, Steven Critchfield wrote:
> It may be just a difference in my experience, but this article you quote
> seems heavily flawed.

It's not far off base if at all.
>
> 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. 

T1 with inband signaling? Robbed bit signaling 
(http://yarchive.net/phone/t1_signaling.html)?

What about clear channel T1?  The higher price on T1 with robbed-bit 
signaling is the phone company's way of disincentivizing their use.  The 
phone company wants you to use SS7+IMT (clear channel T1) to connect to the 
trunk side of the network. It's more efficient and safer for them.

> 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. 

Probably the same deal with T1 clear channel.  

> 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.

Dial-up per-minute ISP are the only game in town in much of the world - and 
will be for a long time I'll guess.  I am curious about quantity of VGC 
(voice grade channels) used in * users operations regardless of application 
(data or voice).  

I have heard that some operators are losing the PRI option and are being 
forced to use SS7/IMT to connect to the PSTM.  Anybody else heard this?
>
> 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,

-- 
Mike M.