[Asterisk-Users] How to use a data T-1?

[Warren]

So let's assume I am going to use G.729A.  I am looking at using Polycom
IP601 phones which support G729A directly, so the only licenses I
believe I would need are for the calls going to voicemail or in the menu
system at once - realistically that number never exceeds 5 simultaneous,
since the phones can handle the CODEC and no transcoding is needed, so
those do not need licenses according to
http://www.voip-info.org/wiki-Asterisk+G.729+Licensing.

It looks to me like, for testing, I can get a couple of the polycom
phones and have a server using an IP on the unused T1.

Assuming that is correct (which I will write up as an article for the
Wiki if anyone is interested when this is all done), the next thing I
need is a provider of VoIP service.  Also, it seems like the server
would go on the outside of my firewall with holes punched through for
the phones which would be on the ind=side of the firewall.  Would that
be correct?

W

Steve Langstaff wrote:

> Remember to add the RTP, UDP and IP overheads.
>  
> And then just do the math.
>
>     -----Original Message-----
>     *From:* asterisk-users-bounces at lists.digium.com
>     [mailto:asterisk-users-bounces at lists.digium.com]*On Behalf Of
>     *William Piper
>     *Sent:* 19 June 2006 17:12
>     *To:* Asterisk Users Mailing List - Non-Commercial Discussion
>     *Subject:* Re: [Asterisk-Users] How to use a data T-1?
>
>     Depends on the codec. If you are using ulaw, you will only be able
>     to have about 23 calls. If you use g729 you can have as many as
>     187 simultanious calls on a data T1.
>      
>     Remember, you have 1544Kbs of bandwidth.
>     g279=8Kbs per call
>     uLaw=64Kbs per call
>      
>     Just do the math.
>      
>     bp
>
>      
>     On 6/19/06, *Warren* <warren-lists at icruise.com
>     <mailto:warren-lists at icruise.com>> wrote:
>
>         Steve,
>
>         I want to end up with a system that will let me send and
>         receive voice
>         calls.  I guess what I want to do depends on the best way to
>         do that.
>         Can I do more than 23 (decent sounding) voice calls on a data
>         T-1 with
>         someone else handling the final part of the call to the copper
>         for me?
>         If so than that is my likely final destination.
>
>         I have a channelized voice T-1 currently plugged into my meridian
>         system, but I would like (if realistically possible) to do as
>         much of
>         this over IP as possible for maximum flexibility.  Is that a
>         pipe dream
>         or just silly given the current state of technology?
>
>         I am lucky enough to work for a company that is letting me
>         take my time
>         with this, test the various options and come up with the proper
>         solution.  I am assuming (I know: dumb to assume) at this
>         point that
>         VoIP over a T-1 to a provider that can then route it to hard
>         phones for
>         me would be the way to go.  Similarly, I would point my 800
>         number to a
>         DiD hosted by a VoIP provider that would then route the call
>         back to
>         me.  If that is an incorrect assumption, please let me know.
>
>         Regards,
>         Warren
>
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