[cisco-voip] Cisco 8851 not failing over to backup circuit...

[Charles Goldsmith]

What's your MTU over the backup VPN?  I've seen odd issues on some
networks with different providers and MTU and fragmenting packets
always caused issues until the MSS was set.

I'm not sure why this would affect the 8851's, but we've noticed some
other oddities with the 8851's.  For instance, computers with intel
nic's behind the phone have issues after we apply config, and we
narrowed it down to intel gigabit master slave mode setting on the
driver, at least, setting that to slave instead of auto resolves the
problem.  Otherwise, you have to reboot the phone a couple of times to
get consistent connection through the 8851.  Phones are connected to a
2960 with a basic config, nothing out of the ordinary.

On Thu, Apr 23, 2015 at 6:35 PM, Jonathan Charles <jonvoip at gmail.com> wrote:
> We have CUCM 8.6.2 with Cisco 8851, Cisco 8831 phones at a remote location;
> they are connected over MPLS and a Peplink Balance VPN as a backup.
>
> When we yank the MPLS, the 8831 registers with CUCM and works fine.... the
> 8851s do NOT.
>
> Any reason the 8851 would act differently?
>
>
>
>
> Jonathan
>
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