Resolved! 7962/42's no long able to transfer calls since upgrading firmware to SCCP42.9-3-1SR4-1S, cucm ver 7.1.5
We recently upgraded the phone loads on our cluster and ran into this bug. When users on 7942's and 62's attempt to transfer a call while using a headset the call is placed on hold, but no dial tone is provided and the headset light on the phone tur...