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IP Phone restart during OSPF convergation

Answered Question
Apr 28th, 2014
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Hi all,

Between Head office and Branch we have two VPN tunnels: main and backup. As IGP we are using OSPF. When I shut down main VPN tunnel, OSPF installs routes through backup VPN which takes aproximately 2-3 seconds. During that time IP Phones (Alcatel-Lucent) are restarting and we lose phone connection ~1minute.

So what to do, that IP Phones stay connected?

Thanks

Correct Answer by acampbell about 3 years 3 months ago

Hi,

 

You will need to investigate if you can adjust the ip phone keep-a-live

time between your IP phone server & the ip phones.

Sounds like the timer is set at around 3 seconds if you could increase that to 10 seconds

that will give ospf time to converge.

 

Hope this helps

Regards

Alex

 

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Correct Answer
acampbell Mon, 04/28/2014 - 10:19
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  • Green, 3000 points or more

Hi,

 

You will need to investigate if you can adjust the ip phone keep-a-live

time between your IP phone server & the ip phones.

Sounds like the timer is set at around 3 seconds if you could increase that to 10 seconds

that will give ospf time to converge.

 

Hope this helps

Regards

Alex

 

Dennis Mink Mon, 04/28/2014 - 19:36
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  • Blue, 1500 points or more

Even if you were to keep the phones registered by changing the keep alive, that would still mean that while your routing protocol is converging, you cannot use your phones because signalling is impossible.  

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