On 8/4/2015 3:47 AM, A J Stiles wrote:
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 .....
Building on the answer above, have a look at ESL labs - who make such a
relay that can bypass the PRI to the Asterisk server. As well, have a
look at HAAst (www.telium.ca) which can monitor Asterisk and then
control the ESL relay to bypass Asterisk in case of failure.
-Raj-
P.S. My opinions do not necessarily reflect those of my employer. As I
am employed by Telium you can bet that me opinions are biased!
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