[Asterisk-Users] Small office requirements - Can this be done?
wipe_out at users.sourceforge.net
Tue Mar 2 03:40:25 MST 2004
Matt Riddell wrote:
>We do 4 per adsl with gsm every day.
Like I said you should be able to easily do 6 when using GSM..
I have done 2 concurrent iLBC through IAX calls over a 64k ISDN link.. :)
>----- Original Message -----
>From: "WipeOut" <wipe_out at users.sourceforge.net>
>To: <asterisk-users at lists.digium.com>
>Sent: Tuesday, March 02, 2004 11:04 PM
>Subject: Re: [Asterisk-Users] Small office requirements - Can this be done?
>| Steve Kennedy wrote:
>| >On Mon, Mar 01, 2004 at 07:08:29PM -0600, Michael Graves wrote:
>| >>I have disagree about the ADSL. I have a1.5 Mbit/512kbit service from
>| >>Covad (in the US Southwest) and I have sustained 4 calls without a
>| >>problem. I prefer to use GSM over G.711to squeeze it down, but that is
>| >>my choice. I don't feel that call quality is substandard.
>| >That's the crunch (1.5/512) ... it's actually the 512 which is relevent.
>| >Virtually all DSL in the UK is a wholesale product from BT (they have
>| >about 2 million customers, Easynet who local loop unbundle may have
>| >20,000, the rest of the providers maybe another 10,000 between them).
>| >All BT ADSL is 256K upstream, all BT DSL is contented (in theory 20:1
>| >and 50:1, but actually a lot less than that), there are a few providers
>| >doing their own contention over BT's product.
>| >However the 256K upstream is still the limiting factor, so you can get
>| >one, and MAYBE two VoIP lines over it. If BT would up the upstream to
>| >512, you could probaly get 4 out of it ....
>| On the UK DSL using G.711 you should easily get 2 concurrect calls,
>| G.711 uses about 84k(incl overhead) in each direction, so 2 calls would
>| be 168K (of the 256k)
>| If you switch o GSM or iLBC you should get 6 concurrent calls, and if
>| you were to use IAX2 trunking you could *maybe* squeeze another one..
>| Other codecs could offer even more but I haven't tested them..
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