Laurent CARON
2007-Apr-28 14:22 UTC
[asterisk-users] Poor man's High Availability solution
Hi, I'm wondering what the best option to obtain a high availability asterisk server is. I currently use a TE410P (4 x E1) card. I'm thinking of 2 different solutions: - 2 servers configured with Heartbeat + DRBD (drbd mainly for voicemail....) and the E1 span plugged to the 2 servers (with a TE410P in each server). - 2 servers configures with Heartbeat + DRBD with the E1 span hooked to an ISDN guard connected to the main server and the backup one. Here comes the real question. Is it "technically" good to connect an E1 span to 2 cards at the same time (with only one accepting the calls). Since it is possible with BRI cards, i'm wondering if it could be done with PRI. Thanks Laurent
Hi Laurent -> Is it "technically" good to connect an E1 span to 2 cards at the same > time (with only one accepting the calls). > > Since it is possible with BRI cards, i'm wondering if it could be done > with PRI.Nope. You can use a device like the Redfone fonebridge to convert the PRI to TDMoE. Possible Downside: I've read some reports that say the TDMoE module in asterisk is not so stable. I've heard of a device that acts as a failover for a PRI line so you can plug a PRI into two different devices and have the PRI failover if one device fails. Unfortunately nothing like this is commercially available today. Another option: You can get some backup analog PSTN lines (or an additional PRI), and work with your Telco to do something like a busy-redirect - if the PRI device ever fails, calls go to the PSTN lines. Of course, you'd lose DID capability in this scenario, but at least your calls would go through. - Noah
On Sat, 2007-04-28 at 23:22 +0200, Laurent CARON wrote:> Hi, > > I'm wondering what the best option to obtain a high availability > asterisk server is. > > I currently use a TE410P (4 x E1) card. > > I'm thinking of 2 different solutions: > > - 2 servers configured with Heartbeat + DRBD (drbd mainly for > voicemail....) and the E1 span plugged to the 2 servers (with a TE410P > in each server). > > - 2 servers configures with Heartbeat + DRBD with the E1 span hooked to > an ISDN guard connected to the main server and the backup one. > > Here comes the real question. > > Is it "technically" good to connect an E1 span to 2 cards at the same > time (with only one accepting the calls).Have a look at the ISDNguard product on the Junghanns.net website: http://www.junghanns.net/en/ISDNguard_produkt.html Regards, Patrick
On 28 Apr 2007, at 22:22, Laurent CARON wrote:> Hi, > > I'm wondering what the best option to obtain a high availability > asterisk server is. >Here's what we do when consulting in this area: First decide what the maximum acceptable downtime is, and what the costs to the business of that downtime would be. Use that as the starting point for the HA design. Discuss with the telco what they can do. Avoid complexity at _all_ costs.> Since it is possible with BRI cards, i'm wondering if it could be done > with PRI.No, BRI has a 'bus' topology, PRI is point-to-point. Taking a BRI from the same telco into a second asterisk box and having them redirect calls to it when the PRI is down could be pretty economical. In fact if you could persuade them to put the BRI in the same hunt group, but at a lower priority the switch over would be seamless at their end - all you would need to do is ensure the main asterisk powered itself off if it crashed, thus dropping the PRI. Tim Panton (speaking as westhawk....) www.westhawk.co.uk/
Who resells these products in the USA or at least ships here? Thanks, Steve Totaro http://www.asteriskhelpdesk.com KB3OPB> -----Original Message----- > From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users- > bounces@lists.digium.com] On Behalf Of Sune Kloppenborg Jeppesen > Sent: Saturday, April 28, 2007 7:19 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [asterisk-users] Poor man's High Availability solution > > On Sunday 29 April 2007 01:06, Noah Miller wrote: > > I've heard of a device that acts as a failover for a PRI line so you > > can plug a PRI into two different devices and have the PRI failoverif> > one device fails. Unfortunately nothing like this is commercially > > available today. > Sounds like the ISDNguard: > http://www.junghanns.net/en/ISDNguard_produkt.html > > HTH > > -- > Med venlig hilsen > > Sune Kloppenborg Jeppesen > kloppenborg.net > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users
Vicente Aguilar
2007-Apr-30 01:29 UTC
[asterisk-users] Poor man's High Availability solution
Hi We've got a redfone here and it's working great so far, despite all the TDMoE bad press. The 4-span version is slightly more expensive than a TE410P, so in the end it's gonna be a more affordable solution as you'd need two digium cards (plus maybe the ISDN guard). The downside is that it doesn't have echo cancellation, so you'll have to do it via software while some cards do it on hardware (faster, better, less CPU-intensive...) El s?b, 28-04-2007 a las 23:22 +0200, Laurent CARON escribi?:> Hi, > > I'm wondering what the best option to obtain a high availability > asterisk server is. > > I currently use a TE410P (4 x E1) card. > > I'm thinking of 2 different solutions: > > - 2 servers configured with Heartbeat + DRBD (drbd mainly for > voicemail....) and the E1 span plugged to the 2 servers (with a TE410P > in each server). > > - 2 servers configures with Heartbeat + DRBD with the E1 span hooked to > an ISDN guard connected to the main server and the backup one. > > Here comes the real question. > > Is it "technically" good to connect an E1 span to 2 cards at the same > time (with only one accepting the calls). > > Since it is possible with BRI cards, i'm wondering if it could be done > with PRI. > > Thanks > > Laurent > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users-- Vicente Aguilar <vjaguilar@renr.es> Dpto. de Infraestructuras Tlf.: 965 98 71 92 Recursos en la Red, S.L.U. http://www.renr.es
Laurent Caron
2007-May-02 15:47 UTC
[asterisk-users] Poor man's High Availability solution
On Sun, Apr 29, 2007 at 09:06:53PM +0200, Clayton Milos wrote:> Since a PRI is a physical connection as well as a logical one, if you can > get the server to shut down when it has a problem you could put a 4-pole > relay to change the PRI over to the other box. >I think the ISDNGuard is more or less like a relay. Here is how I plan to set it up. Hook the Pri to the Net port of the ISDNGuard, hook the first port of each asterisk server's pri card to the 1st ast CPE and isdn CPE port, hook the second port of the pri card to the 2nd ast CPE and isdn CPE port, and finally plug the second Net port to the legacy PABX. |--------AST1------| | | T2 ====== |=========Legacy PABX | | |--------AST2------| Net ports Ast CPE ports Isdn CPE ports 1 2 3 4 1 2 3 4 1 2 3 4 | | | | | | | | | | | | | | | | | | I L | | | | n e I O I O c g n u n u o a p t p t m c u p u p i y t u t u n t t g P A f f P B r r R X 1 o 1 o I s m s m t t A A p S p S o T o T r 1 r 2 t t t t o o o o f f l l A e A e S g S g T a T a 1 c 2 c y y Do you think this is the correct way of plugging two asterisk servers in front of a legacy pabx ? Thanks Laurent
On Sun, Apr 29, 2007 at 09:06:53PM +0200, Clayton Milos wrote:> Since a PRI is a physical connection as well as a logical one, if you can > get the server to shut down when it has a problem you could put a 4-pole > relay to change the PRI over to the other box. >The ISDN Guard is an excellant product from what I've seen of it,and you would be well served by it.We are in the process of releasing (Product is ready, working on sales channels) a somewhat simpler product, the FSV-4PFS. It will handle two asterisk server redundancy,for significantly less cost.http://www.failsafevoip.com/images/4PFS/FSV-4PFS-Datasheet.pdfA demo of it in action:http://www.failsafevoip.com/images/4PFS/FSV-4PFS_Demo.aviFailSafeVOIP, Inc.www.failsafevoip.comContact for additional info: sales@failsafevoip.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20070503/154262e7/attachment.htm
On Sun, Apr 29, 2007 at 09:06:53PM +0200, Clayton Milos wrote:> Since a PRI is a physical connection as well as a logical one, if you can > get the server to shut down when it has a problem you could put a 4-pole > relay to change the PRI over to the other box. >The ISDN Guard is an excellant product from what I've seen of it, and you would be well served by it. We are in the process of releasing (Product is ready, working on sales channels) a somewhat simpler product, the FSV-4PFS. It will handle two asterisk server redundancy for significantly less cost. http://www.failsafevoip.com/images/4PFS/FSV-4PFS-Datasheet.pdf A demo of it in action: http://www.failsafevoip.com/images/4PFS/FSV-4PFS_Demo.avi FailSafeVOIP, Inc. www.failsafevoip.com Contact: sales@failsafevoip.com