Howto:Fault tolerance setup with three ISDN BRI lines: Difference between revisions
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As | As known, when using an IP800, an ISDN fault tolerance scenario can be realized. This is possible because an IP800 has the possibility to switch two ISDN BRI lines to a standby PBX (Gateway) in case of fault. | ||
But what if a customer has three BRI lines? | But what if a customer has three BRI lines? | ||
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This information applies to | This information applies to | ||
IP800 | * IP800 | ||
<!-- Keywords: ISDN, Fault tolerance, standby, Relay --> | <!-- Keywords: ISDN, Fault tolerance, standby, Relay --> | ||
===Problem Details=== | ===Problem Details=== | ||
IP800 has just two | IP800 has just two relays and therefore just two BRI interfaces can be switched, but you can use the second unit even in normal operation. | ||
Just add some simple routings and wire the setup as show in the following picture: | Just add some simple routings and wire the setup as show in the following picture: | ||
Line 74: | Line 74: | ||
Note: You need on each Gateway 3 x BRI and 6 x DSP license. | Note: You need on each Gateway 3 x BRI and 6 x DSP license. | ||
== Related Articles == | |||
[[Howto:How_ISDN_wiring_works]] | * [[Reference:Configuration/BRI/Physical|Pinout of the BRI connector]] | ||
* [[Howto:How_ISDN_wiring_works]] | |||
[[Category:Howto|{{PAGENAME}}]] | [[Category:Howto|{{PAGENAME}}]] |
Latest revision as of 11:05, 25 October 2011
As known, when using an IP800, an ISDN fault tolerance scenario can be realized. This is possible because an IP800 has the possibility to switch two ISDN BRI lines to a standby PBX (Gateway) in case of fault.
But what if a customer has three BRI lines?
No problem, here is how to deal this using still using just two IP800.
Applies To
This information applies to
- IP800
Problem Details
IP800 has just two relays and therefore just two BRI interfaces can be switched, but you can use the second unit even in normal operation.
Just add some simple routings and wire the setup as show in the following picture:
The blue lines represent the active ISDN lines, the red ones cabling waiting for action.
In normal operation the GW1 (the active PBX) will handle line 1 and 2 while the standby GW work with line 3 and via the network communicate with the GW1 (and active PBX).
The following ISDN lines will terminate on the Gateway/Port:
Line 1: GW1 – Tel1
Line 2: GW1 – Tel3
Line 3: GW2 – Tel3
In case of failure of the GW1 the following setup is given:
The following ISDN lines will terminate on the Gateway/Port:
Line 1: GW2 – Tel1
Line 2: GW2 – PPP
Line 3: GW2 – Tel3
If instead standby GW fails, the following setup is automatically given:
The following ISDN lines will terminate on the Gateway/Port:
Line 1: GW1 – Tel1
Line 2: GW1 – Tel3
Line 3: GW1 – PPP
Even if both gateways fail there is no shortcut, because the electrical situation will be the following:
The lines will end to the following (not working) port.
Line 1: GW2 – Tel1
Line 2: GW2 – PPP
Line 3: GW1 – PPP
Note: The article describes the hardware wiring, the logical setup in the routing table is not part of this description, but follows the hardware design and is simple.
Note: You need on each Gateway 3 x BRI and 6 x DSP license.