I have an SV8100 with 8.0 software. I'm using a UM8000 for the voice mail and it has been upgraded to the latest software. I have 1 ext, ext 110, that if she's on the phone and a call is transferred to her, the caller hears "I'm sorry I didn't hear your selection". Not every time. She is in the same COS as all the other phones and it's only 110. I tried it 3 times with her on another line and I got through fine twice. I'm told that it's not operator error. They do use the 7 for quick transfer. Any hints?