[asterisk-users] Converting GSM calls to SIP

[Tonty T]

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.


On Wed, Apr 14, 2010 at 2:46 PM, Jeff Brower <jbrower at signalogic.com> wrote:

> > On Wed, Apr 14, 2010 at 10:33 AM, Tonty T <tonty2 at gmail.com> wrote:
> >
> >> This is a solution they proposed, using GSM gateways, but it wont let me
> >> handle 1000 simultaneous calls, the other option was using an E1 but the
> >> cost would be too much to deploy 35 E1s to support that many calls.
>  There
> >> might be a better way of doing it.
> >>
> >>
> > If you are planning on having 1000 simultaneous calls, you're going to be
> > looking at a hefty price tag one way or the other.  Things to consider -
> if
> > you're going to have 1000 concurrent calls going out over VoIP trunks
> (SIP /
> > IAX / whatever), you need to have enough bandwidth to comfortably handle
> > that many calls (each g729 is 8Kb/s bandwidth (but you need to pay a
> license
> > fee for each channel of g729), each g711alaw is 64Kb/s, etc). That amount
> > of bandwidth won't be cheap, plus the cost of the ITSP giving your 1000
> > concurrent channels to call on.  On the other hand, if you have a bank of
> > E1's, which support (I think) at max 30 concurrent voice channels, you'd
> > need 34 available E1 spans.  I'm not sure if you can get 34 spans working
> in
> > a single asterisk server (there was some discussion about this recently
> on
> > this list), and you'd have the cost of 34 E1 spans as well.
>
> All good points.  It might be worth mentioning that including IP/UDP/RTP
> packet overhead, actual bandwidth is 40 kbps
> for G729 and 96 kbps for G711.
>
> -Jeff
>
>
>
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