When the users retrieve the messages using the TUI (Telephone User Interface) in other words when they press the messages button and login, then yes, you use a port and there is no way to avoid this. But if you have Unified Messaging and you are checking the inbox from your outlook then you do not use a port.
To see the port usage you can go to the Tools Depot and open the Port Status Monitor to see when are the ports been used.
If you have UM and are using VMO and are checking messages via Outlook and your phone is the playback device, then a port will be used.
Jorge is right so whenever TRaP is used a port is used. TRaP Telephone Record and Playback. If you are listening to your messages on your computer via headphones and a soundcard then a port is not used.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
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