[Asterisk-Users] Re: T1 questions - could I got VoIP instead?

[Tom Rymes]

On Oct 21, 2005, at 9:37 AM, Michaël Gaudette wrote:

[snip]

> I have (yet another) follow-up question...my hypothetical company  
> had 24 external lines and 72 internal employees.  Which is why a T1  
> was the answer. Now that I think of it, couldn't I use VoIP instead  
> for the external lines (I'm not looking at the internal lines right  
> now, just trying to figure out whats cheaper for outside access).
>
> Meaning, couldn't I have 72 phone number coming in throught my VoIP  
> provider, sent to my Asterisk PBX through normal Internet plumbing  
> and then channel it to whatever internally.

Mike,

You could easily do this, but keep in mind you will probably need a  
full T1 of data bandwidth (1.5mb/s) to handle the call volume. This,  
of course, depends on the codec used, which will, in turn, affect  
your CPU load... Don't forget about QOS, too, and you might want to  
consider using a dedicated data line for the voice traffic, just in  
case your 50 windows clients all download the latest 5MB update via  
automatic update. (that tends to have a negative effect on your QOS  
for voice traffic!)

Anyhow, I think you will find that the ITSP/VOIP route will be very  
workable, but it will also be somewhat less reliable, simply because  
the PSTN is so darned reliable. In the event that you choose this  
route, you won't need the equipment for incoming lines, since they  
all come in via ethernet.

Tom
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