<div dir="ltr">MTU was set to 1440, we set it to Auto, no change... <div><br></div><div><br></div><div><br></div><div>Jonathan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Apr 23, 2015 at 10:13 PM, Charles Goldsmith <span dir="ltr"><<a href="mailto:wokka@justfamily.org" target="_blank">wokka@justfamily.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">What's your MTU over the backup VPN? I've seen odd issues on some<br>
networks with different providers and MTU and fragmenting packets<br>
always caused issues until the MSS was set.<br>
<br>
I'm not sure why this would affect the 8851's, but we've noticed some<br>
other oddities with the 8851's. For instance, computers with intel<br>
nic's behind the phone have issues after we apply config, and we<br>
narrowed it down to intel gigabit master slave mode setting on the<br>
driver, at least, setting that to slave instead of auto resolves the<br>
problem. Otherwise, you have to reboot the phone a couple of times to<br>
get consistent connection through the 8851. Phones are connected to a<br>
2960 with a basic config, nothing out of the ordinary.<br>
<div><div class="h5"><br>
On Thu, Apr 23, 2015 at 6:35 PM, Jonathan Charles <<a href="mailto:jonvoip@gmail.com">jonvoip@gmail.com</a>> wrote:<br>
> We have CUCM 8.6.2 with Cisco 8851, Cisco 8831 phones at a remote location;<br>
> they are connected over MPLS and a Peplink Balance VPN as a backup.<br>
><br>
> When we yank the MPLS, the 8831 registers with CUCM and works fine.... the<br>
> 8851s do NOT.<br>
><br>
> Any reason the 8851 would act differently?<br>
><br>
><br>
><br>
><br>
> Jonathan<br>
><br>
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</blockquote></div><br></div>