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

[Tim McKee]

Expanding on this comment...

The insurance company's customer service staff (definitely not techies) had
no trouble at all adjusting to the latency, indeed, they didn't even appear
to notice it...  They had considerably more trouble remembering how to do a
blind transfer to the spanish speakers... 

Tim

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tim McKee
Sent: Tuesday, September 14, 2004 9:45 PM
To: jarruda-asterisk at jarruda.com; 'Asterisk Users Mailing List -
Non-Commercial Discussion'
Subject: RE: [Asterisk-Users] Extending E1's over a Satellite link


Actually, a single hop satellite conversation isn't much worse than some
cell phone systems.  ~350ms latency.

After a few moments of talking the normal person adjusts to it without much
notice.  Indeed, many overseas links in the past (and present for that
matter) are done via satellite.

Tim 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Julio Arruda
Sent: Tuesday, September 14, 2004 5:33 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Extending E1's over a Satellite link

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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