Please make sure you have run the Impedance Matching on each of your FXO lines (in the other thread we had you move one of the FXO lines to port 3 so need to run it on that port). What is happening here is that when the PSTN user disconnect the UC320W is not seeing the CPC disconnect tone on the FXO and so when voicemail reaches the max message length of 10 minutes, voicemail will disconnect the call. Normally, when there are two people in a talking state and then they hang up both parties hang up within a few moments of each other, clearing the call in both directions. Impedance matching will help make CPC disconnect tone detection more accurate.
What REGION do you have set in your UC320W out of curiosity?
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