Network: Failover to 2nd ISP

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deanpar7605 asked Jul 30, '16 jenn-community-moderator commented Sep 30, '20

Network: Failover to 2nd ISP

Small office with 30 phones - we have a Cisco 5520 firewall configured to failover to a secondary ISP (Different Static IP) if we lose service, the failover happens in 2 seconds -- is there any way to keep phone calls alive if the outgoing IP address changes mid call?

In my testing the phone has a registration problem when the failover occurs

The internet has no issue when the failover happens - videos continue to stream, email works, etc.

hardware

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Answer 1 · 2016-07-30T21:39:06Z

danno147 answered Jul 30, '16

SIP trunking will drop when the primary connection is lost. Will need time to re-register on the secondary connection.

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Answer 2 · 2016-08-03T03:50:25Z

bjsvec answered Aug 3, '16

Search for BigLeaf. They and some others have specialized SDN appliances designed for redundant voip circuits.

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Answer 3 · 2016-08-03T15:40:41Z

bjsvec answered Aug 3, '16

I'll leave this here: http://www.bigleaf.net/overview/

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Answer 4 · 2016-08-03T18:03:46Z

ringcentral35 answered Aug 3, '16 bjsvec commented Apr 20, '20

DeanPar, what equipment are you using now as a Failover? we have a couple of offices with Charter/CenturyLink + Verizon, but we have the same problem if the main line goes down, after a couple of seconds the Wireless Verizon line comes up, but the phones need time to re-register... BigLeaf is a 3rd party company providing continuous service ? Interesting... Is the only way to do it ?

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bjsvec commented · Aug 03, 2016 at 06:16 PM

I have not used BigLeaf first hand, but have researched them a bit. I think the gist of it is their box does load balancing in a smart way (SDN buzz word) and makes all connections appear to come from one IP address effectively fooling the hosted service provider into thinking you have a single circuit when you may actually have two or more.

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Answer 5 · 2016-08-03T18:17:54Z

deanpar7605 answered Aug 3, '16

Claudio - We failover from one ISP to another ISP (Comcast Cable - Verizon FIOS) - but have issues with the phones. Both ISP connections go into a Cisco Firewall which is setup to monitor the primary connection out to 4.4.2.2 - if the ping echos stop for more than 2 secs we failover - the Firewall senses when the connection is available and reverts back. Currently we are tracking which service is the most reliable and using that as primary... I have not yet looked into BigLeaf - did a little reading and may contact them...

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Answer 6 · 2020-09-29T03:45:35Z

Brad Johnson answered Sep 29, '20 jenn-community-moderator commented Sep 30, '20

Does anyone know the time required to re-register, willing to sacrifice the existing call but can't wait 10 minutes for the phones to come back on line.

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jenn-community-moderator ♦ commented · Sep 30, 2020 at 03:55 PM

Hello @Brad Johnson , apologies! I highly suggest you create a case for this. You can click HERE, to open a case. Thank you!

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