Strange issue that's just started happening with a few 6921 phones.
On our cisco switch when port is configured with data and voice vlan, the phone picks up an IP address from the data vlan and in turn doesn't register. It's as if it doesn't see the voice vlan. As soon I remove the data vlan and have voice vlan only on the port, phone picks up IP from the voice network and registers against the CME. This all worked before on the same ports, nothing changed. It just suddenly stopped working.
Just to follow up for those who may run across this issue. I ended up opening a TAC case and as soon as the engineer got into the switch to look around, everything started working again AUTOMAGICALLY. So I have no clear explantion as to why this happened or what caused it. It lasted about two hours where either the phone or the PC would work but not both of them, and all I can think of is that someone plugged some unauthorized device into the network. However I have no proof of that in any logs or what have you. There was nothing wrong with the switch's configuration and it was happening with both 7962 and 7942 phones On a CUCM 8.x enviroment.
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