That's is all the overhead I am trying to avoid. What I need is a DID with unlimited channel, but they do not offer DIDs in that country. I wanted to know for example when I get a DID from lets say Vitelity, with unlimited channel, what are they using to forward the calls via SIP or IAX to my server? If I knew the details of the process, I could probably tell them to used this method and route the short code to me via SIP. And if it requires hardware I could invest in it myself and have them host it.<div>
<br><br><div class="gmail_quote">On Wed, Apr 14, 2010 at 2:46 PM, Jeff Brower <span dir="ltr"><<a href="mailto:jbrower@signalogic.com">jbrower@signalogic.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div></div><div class="h5">> On Wed, Apr 14, 2010 at 10:33 AM, Tonty T <<a href="mailto:tonty2@gmail.com">tonty2@gmail.com</a>> wrote:<br>
><br>
>> This is a solution they proposed, using GSM gateways, but it wont let me<br>
>> handle 1000 simultaneous calls, the other option was using an E1 but the<br>
>> cost would be too much to deploy 35 E1s to support that many calls. There<br>
>> might be a better way of doing it.<br>
>><br>
>><br>
> If you are planning on having 1000 simultaneous calls, you're going to be<br>
> looking at a hefty price tag one way or the other. Things to consider - if<br>
> you're going to have 1000 concurrent calls going out over VoIP trunks (SIP /<br>
> IAX / whatever), you need to have enough bandwidth to comfortably handle<br>
> that many calls (each g729 is 8Kb/s bandwidth (but you need to pay a license<br>
> fee for each channel of g729), each g711alaw is 64Kb/s, etc). That amount<br>
> of bandwidth won't be cheap, plus the cost of the ITSP giving your 1000<br>
> concurrent channels to call on. On the other hand, if you have a bank of<br>
> E1's, which support (I think) at max 30 concurrent voice channels, you'd<br>
> need 34 available E1 spans. I'm not sure if you can get 34 spans working in<br>
> a single asterisk server (there was some discussion about this recently on<br>
> this list), and you'd have the cost of 34 E1 spans as well.<br>
<br>
</div></div>All good points. It might be worth mentioning that including IP/UDP/RTP packet overhead, actual bandwidth is 40 kbps<br>
for G729 and 96 kbps for G711.<br>
<br>
-Jeff<br>
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