[asterisk-users] Looking for PRI Card with automatic fail over

[A J Stiles]

On Monday 03 Aug 2015, Eric Klein wrote:
> Hi all,
> 
> Strange request, I have a customer where we are putting an Asterisk PBX in
> front of a legacy (non-VoIP) PBX. One of the requirements it that the
> Asterisk PBX have 2 PRI ports (on towards the legacy PBX and one towards
> the carrier) with the ability to go to pass through should the Asterisk PBX
> (software or hardware level) fail.
> 
> I did not see this feature in the Digium, Sangoma, Allo, or OpenVox cards.
> 
> Does anyone know of a card that will do this? I know that Digium has an
> external box (the r850) that does something similar for 2 PBXs making them
> high availability, but in this case I only have the 1 Asterisk box acting
> as a gateway and passing some calls out over SIP and IAX2.
> 
> Any suggestions would be appreciated.

Use a 4-pole change-over relay to switch the PRI connection either to the 
Asterisk box if it gets some sort of "heartbeat" signal from the computer  
(say, toggling one of the lines of a printer port, if the motherboard still 
has one),  or the old PABX?

You might have to do some mean, down and dirty low-level programming, to embed 
your heartbeat-generating code in Asterisk's idle loop; but the Source Code is 
out there, if you fancy the challenge .....

-- 
AJS

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