[Asterisk-Users] Extending E1's over a Satellite link

[Tim McKee]

I use G.729 as the codec and use compressed RTP (CRTP) to reduce each call's
bandwidth.  Over satellite and based on slot assignment overhead, that
equates to approximately 17Kbps bidirectional per call.

I haven't tried using IAX trunking, but I suppose you could transcode and
use one of the even lower bandwidth codecs (depending on voice quality).
I'm not sure where you plan on using this, just be aware that some
languages, particulary those with lots of tonal qualities, don't do well
with some codecs.  Physical testing is critical.

tim

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Arinze
Izukanne
Sent: Wednesday, September 15, 2004 8:26 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [Asterisk-Users] Extending E1's over a Satellite link

Being that its a lot of Bandwidth, I need to compress the channels to use
less bandwidth on the transfer.
TDMoE is ruled out. What can I do with Asterisk to achieve this aim.

Best regards

Arinze Izukanne 

--- Paul Mahler <pmahler at signate.com> wrote: 
> A full E1 is a LOT of bandwith to try and push over a satellite link.
>  
> John Todd has reported success with calls via satellite.
>  
> The primary problem you face with a satellite link is, or course, 
> latency.
>  
> There are ways of improving QoS over satellite links.
>  
> Paul
>  
>   
>  
> 
> Paul Mahler 
>  <mailto:pmahler at signate.com> pmahler at signate.com 	
>  <http://www.signate.com/>
> Signate, LLC
> 665 Third Street
> Suite 100
> San Francisco, CA
>  94107-1901
> 
>  Asterisk Services and Training
> 
>  
> 
>  
> 
>  
> 
>  
> 
> 
>   _____
> 
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Arinze 
> Izukanne
> Sent: Monday, September 13, 2004 7:24 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Extending E1's over a Satellite link
> 
> 
> OK. What I am thinking is, It is possible to install a server running 
> Asterisk on each end of the Satellite link, with an
> E1 card in each
> Asterisk; and the boxes are configured to pick up incomming calls  on 
> the E1 channels and pass them to the other box across the link to the 
> other Asterisk PBX which in turn completes the call via the PSTN E1 on 
> that side.
>  
> Basically the aim is to provide a solution that works similar to RAD's 
> VMUX but using Asterisk as the engine.
>  
> I expect there would be codec translation along the way.
>  
> I have this concept but how to implement it is another issue. I need 
> someone who has experience with Asterisk already to tell me how 
> feasible this is and to what extent it would achieve the aim of 
> reducing bandwidth and maintaining minimal latency.
>  
>  
> Best regards
>  
> Arinze
> 
> 
> Kannaiyan Natesan <nkans at speak2world.com> wrote:
> 
> asterisk is a pbx software. I don't think there is a compression and 
> uncompression utility except codec conversions. Even in those cases 
> you can be sure that there will be loss of data as there is no 
> lossless compression.
>  
> If you have any satellite transmission and reception card which can be 
> interfaced for voice communication with asterisk kindly share your 
> views here, we can discuss more on that.
>  
> Asterisk sends calls over internet very efficiently by reducing the 
> ethernet overhead and the channel overheads and that is only in IAX 
> protocol. May be this you can consider to extend for satellite 
> communication.
>  
> If you have more information kindly let us know about it whether 
> anything of the above matches to your interest.
>  
> -Kannaiyan
>  
> 
> ----- Original Message -----
> From: Arinze  <mailto:aizukanne at yahoo.co.uk> Izukanne
> To: asterisk-users at lists.digium.com
> Sent: Monday, September 13, 2004 11:41 PM
> Subject: [Asterisk-Users] Extending E1's over a Satellite link
> 
> hi
>  I want to compress and trunk 2E1 capacity over a satellite SCPC link 
> using asterisk. I am nw to asterisk and I need suggestions on how to 
> implement this.
>  
> Best regards
>  
> Arinze
> 
> 
> 
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