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

[Tim McKee]

Actually that should br your round-trip-time.  One way latency would be half
that. 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Bartosz
Jozwiak
Sent: Wednesday, September 15, 2004 8:56 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Extending E1's over a Satellite link

We have a satellite line and using IAX.
Everything work fine. Latency about 620ms - 680ms

Greetings.

----- Original Message -----
From: "Arinze Izukanne" <aizukanne at yahoo.co.uk>
To: <jarruda-asterisk at jarruda.com>; "Asterisk Users Mailing List -
Non-Commercial Discussion" <asterisk-users at lists.digium.com>
Sent: Wednesday, September 15, 2004 9:40 AM
Subject: Re: [Asterisk-Users] Extending E1's over a Satellite link


> Well Julio, in countries where there are no reliable
> regional communication backbones with lower return
> times, satellites are used and in most cases the
> quality is outstanding for a good implementation even
> for a double hop.
>
> I could give you a call over a satellite link, G729
> and  latency of up to 650ms.
>
>
> Best regards
>
> Arinze Izukanne
>
>
>  --- Julio Arruda <jarruda-asterisk at jarruda.com>
> wrote:
> > Tim McKee wrote:
> > > Guys:
> > >
> > > I routinely run multiple phones over our satellite
> > system (I'm the VP of
> > > Network Services at SDN Global, a satellite
> > bandwidth provider located in
> > > Charlotte NC, US).
> > >
> > > Just last week I went to West Palm Beach, FL US
> > and turned up a 10 phone
> > > emergency call center, complete with ACD queues
> > for an insurance company.
> > > We were able to run all ten phones (Cisco 7960Gs,
> > SIP) on G.729 codecs back
> > > to my * server in Charlotte NC US.  No special
> > settings were required on *
> > > or the phones.
> > >
> > > The satellite system *must* support *REAL* QoS and
> > must have jitter <
> > > ~100ms.  Traditional satellite systems have *lots*
> > more jitter than that.
> > > The actual latency _doesn't matter_ as long as the
> > jitter is steady.  We are
> > > even doing 'double-hop' phone calls successfully,
> > where the latency is
> > > double the normal latency.
> > >
> > > Anyone that wants more detailed info contact me
> > off-list.
> >
> > Out of sheer curisity, the delay itself doesn't make
> > the conversation
> > 'bad' (meaning, walkie-talkie/roger-and-over-like ?)
> > The codec itself should introduce some dozens of ms,
> > but the satellite,
> > is not at least 300ms one way or something like that
> > ? adding the
> > codecs, and the jitter buffers and etc..I wonder how
> > good/bad is it ?
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