asterisk users - Jul 2004 - Desired Install in MotorHome

I've got a client who would love to be able to leave an asterisk
server running sompelace, and achieve telephone connectivity using an
IP phone from within his Motorhome in his words "I want to be able to
work from a mountaintop in Glacier National Park"

I've done some initial testing, and a SNOM200 SIP phone comes close
enough to working that I have not ruled out the idea as completely
un-workable.

I understand that this is an extreamly hostile environment, the
satelite uplink itself introduces too much latency for a standard
configuration to work (1500ms) which is most likely where the problems
come from.

What I'm wondering is if anyone has ever succeded in making a setup
like this work. Different protocol (H.323 MCGP etc) or different
codecs?

Our testing in his driveway revealed the following.

1.  Incoming calls achieve a ring almost immediately, when answered
there is 1 to 2 seconds delay in the conversation (like a really poor
trans-atlantic call)
2.  Outgoing calls fail... the phone returns "Proxy Authentication
Required" however a few seconds later when the handset is picked up
the inbound leg of the RTP stream is preseant on the phone.  Outgoing
audio is non-existant
3.  Attempts to disconnect from that audio stream fail, the * server
is simply not seeing the hangup from the phone.

So whats everyones opinion, worth exploring further, or am I wasting
my time trying?

Thanks in advance.

Paul M. Oster

Paul Oster <paulmoster@gmail.com> wrote:
> I've got a client who [wants VoIP working over a very high-latency
> link]. So whats everyones opinion, worth exploring further, or am I
> wasting my time trying?
Can you stick an Asterisk box at his end so you can speak IAX over the
link? It may not help with the massive delays (which is going to be
inherent in any kind of VoIP over the link) but the signalling should
be a lot more reliable.

-- 
PGP key ID E85DC776 - finger abuse@mooli.org.uk for full key

Being a former "victim" of Starband Services, I'd say chuck the
connection and find a different way to connect.  Your customer will
never have a truly reliable connection, and what he has probably won't
be usable.  2s voice delays are disturbing and frustrating.  Further, an
Asterisk system would be overkill anyway, as it wouldn't be able to do
VM or IVR or any such app while his mobile home is moving.

Alternatives would be SprintPCS's data service which usually clocks
in
>120kb/s on www.wapspeed.com, or T-Mobile's mobile internet service,
once they implement EDGE nationwide.  Of course, your customer will
still be out of reach in large parts of the country... But while we're
talking GSM or PCS services... Why not get a good tri-band phone
instead?
> -----Original Message-----
> From: Paul Oster [mailto:paulmoster@gmail.com] 
> Sent: Wednesday, July 28, 2004 9:30 AM
> To: asterisk-users@lists.digium.com
> Subject: [Asterisk-Users] Desired Install in MotorHome
> 
> 
> I've got a client who would love to be able to leave an 
> asterisk server running sompelace, and achieve telephone 
> connectivity using an IP phone from within his Motorhome in 
> his words "I want to be able to work from a mountaintop in 
> Glacier National Park"
> 
> I've done some initial testing, and a SNOM200 SIP phone comes 
> close enough to working that I have not ruled out the idea as 
> completely un-workable.
> 
> I understand that this is an extreamly hostile environment, 
> the satelite uplink itself introduces too much latency for a 
> standard configuration to work (1500ms) which is most likely 
> where the problems come from.
> 
> What I'm wondering is if anyone has ever succeded in making a 
> setup like this work. Different protocol (H.323 MCGP etc) or 
> different codecs?
> 
> Our testing in his driveway revealed the following.
> 
> 1.  Incoming calls achieve a ring almost immediately, when 
> answered there is 1 to 2 seconds delay in the conversation 
> (like a really poor trans-atlantic call) 2.  Outgoing calls 
> fail... the phone returns "Proxy Authentication Required" 
> however a few seconds later when the handset is picked up the 
> inbound leg of the RTP stream is preseant on the phone.  
> Outgoing audio is non-existant 3.  Attempts to disconnect 
> from that audio stream fail, the * server is simply not 
> seeing the hangup from the phone.
> 
> So whats everyones opinion, worth exploring further, or am I 
> wasting my time trying?
> 
> Thanks in advance.
> 
> Paul M. Oster
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