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« on: January 09, 2013, 06:23:10 PM »
Hi and thanks for the replies. We only use 5240 phones and have about 230 of them in this location. It is an intermittent issue, happens a couple times per day and seems to happen more frequently to 10 or so extensions, though they may just be complaining about it the most. I couldn't tell you for sure if any of the phones having this issue are on the same network switch or not. So far the issue has been between phones on either the same or different controllers, though. Rebooting the phone set always temporarily resolves the issue.
The voice traffic is all on one VLAN at this location. What I don't understand is that Mitel had our support organization do a Wireshark capture on our network to see if they could blame our network, and they came back saying that 3 of our print servers were spitting out too many ARP requests and overwhelming our network. The print servers are on the Data VLAN, so I think they plugged into the wrong port on our switch when they did the capture, otherwise they shouldn't have seen any ARP requests coming from our data VLAN. Just To check, yesterday I ran a Wireshark capture on the voice VLAN and as I expected, no ARP requests appeared from the data VLAN. And the ARP requests were pretty minimal on the voice VLAN.
As you mentioned, I think if we had enough ARP requests to overwhelm our network, we'd be seeing a lot more issues than some phone calls getting one-way audio. Intuition tells me this is a software bug related to 5240 phones that began when we moved to the new Mxe Controllers, but that's just a hunch.