Re: [asterisk-users] Semi-OT Satellite?
On August 23, 2008 07:57:33 pm Alex Balashov wrote: Yes, indeed. Encapsulation protocols such as IPSec/GRE won't work at all over high RTT latency (= 400 ms). Why not? Is there some kind of timing involved in encapsulating data that I'm not aware of? -A. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
Alex Balashov [EMAIL PROTECTED] writes: Yes, indeed. Encapsulation protocols such as IPSec/GRE won't work at all over high RTT latency (= 400 ms). Sure they will. They just won't benefit from TCP acceleration performed by the satellite company. Sadly TCP itself is very slow with high RTT, so without TCP acceleration the satellite link is a bit useless. I don't see why it should be a problem for VoIP though, there's no VoIP acceleration technology. /Benny ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] Semi-OT Satellite?
We're entertaining moving our intranet to Hughes satelite for our remote locations. I'm curious if anyone with Asterisk servers has used satellite, and if so, is the latency an issue. My understanding is that you immediately introduce 250ms latency for travel time up and back down, however it is a much more direct connection then offered by traditional land lines. Perhaps someone has some other suggestions? We've started looking into Global Crossing as an alternative to have more control and reliability between all of our remote facilities, maybe this is a better alternative. Our biggest problem is most of our sites are in smaller cities where your bigger connections are more limited. Looking for any suggestions. Thanks, Ken ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
Ken Williams wrote: We're entertaining moving our intranet to Hughes satelite for our remote locations. I'm curious if anyone with Asterisk servers has used satellite, and if so, is the latency an issue. My understanding is that you immediately introduce 250ms latency for travel time up and back down, however it is a much more direct connection then offered by traditional land lines. Everyone I'm aware of that has tried using VoIP over a satellite based internet connection has been /completely/ dissatisfied. A base ping time of 250ms is simply too high for calls to proceed naturally - you'll end up with people talking over the top of each other. The problem with be exacerbated if both ends are satellite based. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
Hi, using Asterisk over satellite can be done. Not all satellite providers are created equal and some are better than others. If you are going to do communications between offices that are connected over satellite office to office you may have a problem. My personal choice for satellite connections is the Idirect platform. Tom From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ken Williams Sent: Saturday, August 23, 2008 9:44 AM To: asterisk-users@lists.digium.com Subject: [asterisk-users] Semi-OT Satellite? We're entertaining moving our intranet to Hughes satelite for our remote locations. I'm curious if anyone with Asterisk servers has used satellite, and if so, is the latency an issue. My understanding is that you immediately introduce 250ms latency for travel time up and back down, however it is a much more direct connection then offered by traditional land lines. Perhaps someone has some other suggestions? We've started looking into Global Crossing as an alternative to have more control and reliability between all of our remote facilities, maybe this is a better alternative. Our biggest problem is most of our sites are in smaller cities where your bigger connections are more limited. Looking for any suggestions. Thanks, Ken ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
I've used VOIP over satellite for years and while it's not perfect it is sometimes actually better than cellular voice Unless you have a double hop scenario where the traffic makes two satellite hops from one remote to a central hub and then to another satellite remote the latency is actually not noticeable Satellite usually has a latency of 250 - 300 ms and in most cases this does not have a noticeable effect on the conversation Femi _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Moore Sent: 23 August 2008 15:50 To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: Re: [asterisk-users] Semi-OT Satellite? Hi, using Asterisk over satellite can be done. Not all satellite providers are created equal and some are better than others. If you are going to do communications between offices that are connected over satellite office to office you may have a problem. My personal choice for satellite connections is the Idirect platform. Tom From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ken Williams Sent: Saturday, August 23, 2008 9:44 AM To: asterisk-users@lists.digium.com Subject: [asterisk-users] Semi-OT Satellite? We're entertaining moving our intranet to Hughes satelite for our remote locations. I'm curious if anyone with Asterisk servers has used satellite, and if so, is the latency an issue. My understanding is that you immediately introduce 250ms latency for travel time up and back down, however it is a much more direct connection then offered by traditional land lines. Perhaps someone has some other suggestions? We've started looking into Global Crossing as an alternative to have more control and reliability between all of our remote facilities, maybe this is a better alternative. Our biggest problem is most of our sites are in smaller cities where your bigger connections are more limited. Looking for any suggestions. Thanks, Ken ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
I've used C-Band, Ku-Band, and DVB satellite internationally with VoIP for years at a previous employer and rarely had any problems was the sat link was up and running. If you do plan on having 'remote offices', you'll want to make sure they all come back to a central earth station (hub and spoke topology) or you'll have virtually insurmountable latency issues (as Femi mentioned). Whatever you do though, don't stick the remote offices with their own internet bandwidth using VPN to connect to the home office for voice, data services as VPNs are extremely problematic over satellite. _ Darren Sessions [EMAIL PROTECTED] http://www.darrensessions.com _ On Aug 23, 2008, at 4:45 PM, Femi wrote: I’ve used VOIP over satellite for years and while it’s not perfect it is sometimes actually better than cellular voice Unless you have a double hop scenario where the traffic makes two satellite hops from one remote to a central hub and then to another satellite remote the latency is actually not noticeable Satellite usually has a latency of 250 – 300 ms and in most cases this does not have a noticeable effect on the conversation Femi From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] ] On Behalf Of Tom Moore Sent: 23 August 2008 15:50 To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: Re: [asterisk-users] Semi-OT Satellite? Hi, using Asterisk over satellite can be done. Not all satellite providers are created equal and some are better than others. If you are going to do communications between offices that are connected over satellite office to office you may have a problem. My personal choice for satellite connections is the Idirect platform. Tom From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] ] On Behalf Of Ken Williams Sent: Saturday, August 23, 2008 9:44 AM To: asterisk-users@lists.digium.com Subject: [asterisk-users] Semi-OT Satellite? We're entertaining moving our intranet to Hughes satelite for our remote locations. I'm curious if anyone with Asterisk servers has used satellite, and if so, is the latency an issue. My understanding is that you immediately introduce 250ms latency for travel time up and back down, however it is a much more direct connection then offered by traditional land lines. Perhaps someone has some other suggestions? We've started looking into Global Crossing as an alternative to have more control and reliability between all of our remote facilities, maybe this is a better alternative. Our biggest problem is most of our sites are in smaller cities where your bigger connections are more limited. Looking for any suggestions. Thanks, Ken ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users smime.p7s Description: S/MIME cryptographic signature ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Semi-OT Satellite?
Darren Sessions wrote: I've used C-Band, Ku-Band, and DVB satellite internationally with VoIP for years at a previous employer and rarely had any problems was the sat link was up and running. If you do plan on having 'remote offices', you'll want to make sure they all come back to a central earth station (hub and spoke topology) or you'll have virtually insurmountable latency issues (as Femi mentioned). Whatever you do though, don't stick the remote offices with their own internet bandwidth using VPN to connect to the home office for voice, data services as VPNs are extremely problematic over satellite. Yes, indeed. Encapsulation protocols such as IPSec/GRE won't work at all over high RTT latency (= 400 ms). -- Alex Balashov Evariste Systems Web: http://www.evaristesys.com/ Tel: (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (706) 338-8599 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
