I am running into a strange problem with some of my 7942s. For some reason when users transfer a call to someone else, the phone screen freezes for a few seconds before releasing the call. The user is not able to do anything to their phone during that time. The problem happens maybe 2 or 3 times a day.
I am running CUCM version 220.127.116.1100-9. I have upgraded the 7942s that have been effected to phone load version SCCP42.9-3-1SR2-1S. The phone update did not fix the problem. The only commonality between the phones that are affected, that makes them different from phones that are not affected is that they all use plantronics headsets (varying models). We tested one of the phones by unplugging the headset and it seemed to work fine for a week straight. After plugging the headset back in, the problem occured again.
Could the Plantronics headset really be causing the phone to lock up? I have used Plantronics headset on other CUCM environments with no issues. I am kind of at a loss here. Any help would be appreciated.
Also, Are the affected phones connected to a particular switch? I was thinking you can be possibly losing keepalives or something related to network connectivity.
BTW, if you remove the headsets does everything work fine?
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