I'm confused with something, maybe someone can explain to me. if your currently on a pri and are considering moving over to VOIP, that means you would have to purchase a t1 or fractional t1 for a your voip connections. but then, voip connections aren't as reliable as PRI. so then you would probbaly have to get a PRI failover. but then having a PRI failover means that you now have to pay 400 for a T1, then another 400 for your PRI line. wouldn't have you have just defeated the cause of savig money by now having to have a PRI on standby? now costing you 800 a month? wouldn't it almost be the same price to stick with the PRI only? is anyone out there, using a VOIP only with no failover? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20061002/e3e1d547/attachment.htm
stan ford wrote:> I'm confused with something, maybe someone can explain to me. > > if your currently on a pri and are considering moving over to VOIP, > that means you would have to purchase a t1 or fractional t1 for a your > voip connections. > > but then, voip connections aren't as reliable as PRI. so then you > would probbaly have to get a PRI failover. > > but then having a PRI failover means that you now have to pay 400 for > a T1, then another 400 for your PRI line. wouldn't have you have just > defeated the cause of savig money by now having to have a PRI on > standby? now costing you 800 a month? wouldn't it almost be the same > price to stick with the PRI only? > > is anyone out there, using a VOIP only with no failover?We're using VOIP only, no failover. Furthermore we're using it on a cable internet connection. We have a cheap dsl connection for backups. It's been up for about 2 months now and has only been out twice for a small period of time. When that happens the DSL takes over. I don't pretend that this is in anyways comparable to PSTN service but it works pretty well for us. We have three locations. Two of which are set up the same way, the third just has 3 stations and just registers with one of the asterisk boxes at the other locations. I think when you're talking enterprise you definitely want to go with a t1 or two t1's for backup. (I don't really understand how a PRI gives you more reliability than a T circuit. They run over the same copper don't they??) For our purposes however (and I'd like to think I speak for a lot of mid size businesses with < 50 employees) our setup works wonderful. It costs us about $600 all in all (internet access + VOIP) and that's a FAR cry from what we were paying through Covad before. Of course there always will be exceptions (People that need 100% guaranteed uptime), but for the size of our business this works. The only part that REALLY concerns me is our DID's. If our DID provider ever goes down we are screwed. Anyone know of any failsafes for THIS?
If reliability is the issue, then use the PRI *first* then failover to VoIP. If cost savings are the issue, use VoIP then have a 2nd VoIP provider to fail over to, and no PRI. In either scenario, inbound call routing is thorny, some guys that provide both PRI and VoIP can route calls automatically on failover. However, you *will* get 5 9's in any kind of PRI scenario, that is what it is designed to do. If your voice downtime is measured in hundreds or thousands of dollars a minute, use a PRI. ROI on Asterisk depends on how you look at it. I enjoy the fact that licensing costs are zero and you can make it do way cool stuff, and you have access to a huge 3rd party market. But I would get my ass canned if I went to VoIP only and it went down. I do have a hybrid install with a SIP 12 channel connection and 2 BRI's for failover, and the cost savings are 30% over a frac PRI. You don't nessisarily have to do a 1-1 backup of your voice channels, all you need is enough to support 80% or so of your estimated average concurrent use and chances are your users will never know the difference in a failover situation unless it's another 9/11 and everyone is calling out. In that case, you can say, hey, it's another 9/11, no kidding the phones didn't work. -----Original Message----- From: stan ford [mailto:stanford510@yahoo.com] Sent: Monday, October 02, 2006 10:55 AM To: asterisk-users@lists.digium.com Subject: [asterisk-users] t1 voip to failover pri I'm confused with something, maybe someone can explain to me. if your currently on a pri and are considering moving over to VOIP, that means you would have to purchase a t1 or fractional t1 for a your voip connections. but then, voip connections aren't as reliable as PRI. so then you would probbaly have to get a PRI failover. but then having a PRI failover means that you now have to pay 400 for a T1, then another 400 for your PRI line. wouldn't have you have just defeated the cause of savig money by now having to have a PRI on standby? now costing you 800 a month? wouldn't it almost be the same price to stick with the PRI only? is anyone out there, using a VOIP only with no failover? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20061002/12ec3458/attachment.htm
I wouldn't first presume that there is any law that states you have to run
VoIP over a PRI. Other technologies exist such as SDSL - with some providers
speaking of crazy prices such as ?65pcm for 2Mbs 5:1 contention ration and ?100
for 1:1 (U.K) - should be even less in the states if that's where you are.
One option, but not the only one, would be to drop your pri when your contract
ends and take up SDSL - and voila an initial saving, in your case, of a 000 or
more in the year.
You could also have two SDSL lines for a little less than the price of the
PRI. Both lines would not only serve for High Availability -possibly even better
availability than single PRI- but could also, actively, both switch traffic,
giving you 4Mbps of bandwidth for your VoIP, or if you choose, some other
requirement while not required as failover - all for the price of less than one
PRI.
Then there is compression - 64k non negotiable, per channel for PRI, and
flexible -i.e., less the 64k- for VoIP (International high quality Calls are
transported at 16k), giving you the capacity to potentially service more traffic
with less initial outlay.
Other real cost efficiencies come in the form of the fact that IP-to-IP
(local/national/international) calls are free. So if you have a lot of
inter-branch communications, or communications you can switch on to IP, you can
totally erradicate this cost - unlike with the PRI where you will still be
subject to payment.
Think like this - say I have two offices - one in london and the other New
York. How much will I save by moving my calls on to VoIP with no per-time or
call setup charges.
Features related to OAM&P, can also be faster and cheaper with you having
a lot more power in your hands.
In real senses, and with regards to reliability, you should take in to
consideration the great moves currently being made by telecom companies
(incumbents most especially), with regards to a complete shift to NGNs, which
have a strong focus on ToIP. With new fiber (FTTP), new technology, etc, a lot
of networks are highly reliable at the present moment - I guess this would also
depend on where you are.
The thing about it is that complete IP networks in terms of telecom now look
inevitable. And whether you do it yourself or it is done for you - it is the way
things, many expect, are going to be in the next 5 or so years.
stan ford <stanford510@yahoo.com> wrote:
I'm confused with something, maybe someone can explain to me.
if your currently on a pri and are considering moving over to VOIP, that
means you would have to purchase a t1 or fractional t1 for a your voip
connections.
but then, voip connections aren't as reliable as PRI. so then you would
probbaly have to get a PRI failover.
but then having a PRI failover means that you now have to pay 400 for a T1,
then another 400 for your PRI line. wouldn't have you have just defeated the
cause of savig money by now having to have a PRI on standby? now costing you 800
a month? wouldn't it almost be the same price to stick with the PRI only?
is anyone out there, using a VOIP only with no failover?
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com _______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
---------------------------------
Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.digium.com/pipermail/asterisk-users/attachments/20061002/91d29bf3/attachment-0001.htm