[asterisk-users] t1 voip to failover pri

[Colin Anderson]

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 at yahoo.com]
Sent: Monday, October 02, 2006 10:55 AM
To: asterisk-users at 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?

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