If I have learned anything from years in the RF business I have learned anything is possible, in terms of your issue, I find it highly unlikely that the phone would produce EMI in the range you specify and at the strength that it sounds as though it's doing. With that being said it's possible I've never had the equipment on hand to test a 7925 that low, so I can't say from my perspective definitively oneway or the other on it.
I'd suggest they try shutting off the phones and see if the noise source goes away.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...