Responding to Matt Riddell, M Shokuie, A J Stiles, and Telium Support (all below)

Thanks for the suggestions, but a separate gateway is a problem in the design as the configuration is basically:

Carrier --- PRI --- Asterisk (with failover) ---- Legacy PBX
                              |
                              - SIP / IAX2 -- our service or remote office

As this is already acting as a gateway adding another box to the mix seems a bit over kill (unless I can embed it and the asterisk PBX into a 2 U pizza box). But since most gateways are designed to be used for fail over servers / PBXs not lines I am not sure that this would benefit us.

So far I have found 1 company that seems to have a gateway card and that is the beroNet PCI / PCIe Gateway Cards which they say has the card level failover. I will update the list should this meet the use case.
Eric

    ----------------------------------------------------------------------

    Message: 1
    Date: Mon, 3 Aug 2015 13:54:05 -0500
    From: Matt Riddell <li...@venturevoip.com
    <mailto:li...@venturevoip.com>>
    To: Asterisk Users Mailing List - Non-Commercial Discussion
            <asterisk-users@lists.digium.com
    <mailto:asterisk-users@lists.digium.com>>
    Subject: Re: [asterisk-users] Looking for PRI Card with automatic fail
            over
    Message-ID: <2539d3b3-4981-468f-95af-34d9d6a17...@venturevoip.com
    <mailto:2539d3b3-4981-468f-95af-34d9d6a17...@venturevoip.com>>
    Content-Type: text/plain; charset="us-ascii"

    Yep it was red fone

    http://red-fone.com

    7 years ago :-)

    http://www.venturevoip.com/detail.php?news_id=1927

    --
    Cheers,

    Matt Riddell
    _______________________________________________

    http://www.venturevoip.com/news.php (Daily Asterisk News)
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    http://www.venturevoip.com/exchange.php (Full ITSP Solution)
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    Message: 2
    Date: Mon, 3 Aug 2015 23:31:29 +0430
    From: M Shokuie <sena...@gmail.com <mailto:sena...@gmail.com>>
    To: Asterisk Users Mailing List - Non-Commercial Discussion
            <asterisk-users@lists.digium.com
    <mailto:asterisk-users@lists.digium.com>>
    Subject: Re: [asterisk-users] Looking for PRI Card with automatic fail
            over
    Message-ID:
<CAJC6NeY7if_T-YspbccLLf2ZiL4LOBt45ajJ=kKsgWn=7nz...@mail.gmail.com <mailto:7nz...@mail.gmail.com>>
    Content-Type: text/plain; charset="utf-8"

    Hi there,

    Using Sangoma Vega400 gateway you'll have what is called
    resilliency which
    is exactly what you are looking for.

    Regards.
    --
    M. Shokuie Nia
    On Aug 3, 2015 18:51, "Eric Klein" <eric.kl...@greenfieldtech.net
    <mailto:eric.kl...@greenfieldtech.net>> 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.
    >
    > Thanks
    > Eric
    >
    > --
    >
    _____________________________________________________________________
    > -- Bandwidth and Colocation Provided by
    http://www.api-digital.com --
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    Message: 3
    Date: Tue, 4 Aug 2015 08:47:02 +0100
    From: A J Stiles <asterisk_l...@earthshod.co.uk
    <mailto:asterisk_l...@earthshod.co.uk>>
    To: "Asterisk Users Mailing List - Non-Commercial Discussion"
            <asterisk-users@lists.digium.com
    <mailto:asterisk-users@lists.digium.com>>
    Subject: Re: [asterisk-users] Looking for PRI Card with automatic fail
            over
    Message-ID: <201508040847.02341.asterisk_l...@earthshod.co.uk
    <mailto:201508040847.02341.asterisk_l...@earthshod.co.uk>>
    Content-Type: Text/Plain;  charset="utf-8"

    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

    Note:  Originating address only accepts e-mail from list! If
    replying off-
    list, change address to asterisk1list at earthshod dot co dot uk .



    ------------------------------

    Message: 4
    Date: Tue, 4 Aug 2015 08:23:47 -0400
    From: Technical Support <supp...@telium.ca <mailto:supp...@telium.ca>>
    To: asterisk-users@lists.digium.com
    <mailto:asterisk-users@lists.digium.com>
    Subject: Re: [asterisk-users] Looking for PRI Card with automatic fail
            over
    Message-ID: <55c0aed3.4030...@telium.ca
    <mailto:55c0aed3.4030...@telium.ca>>
    Content-Type: text/plain; charset=windows-1252; format=flowed

    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 <http://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!




If you place an ESL PRI A/B switch on either side of the Asterisk server you can easily bypass the Asterisk server, or place it inline with the PRI link.

You can also chose to TAP the lines as noted above, but you have to ensure that both PRI cards don't go live at once...(if I understand that product correctly).
-- 
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