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By default the packet size is 30 ms, if I remember correctly. I changed it to 20 ms for all my accounts. I have low pings and a good internet connection. So I don't have any problems using 20 ms. You can change it by editing the file /var/flash/voip.cfg.
Use the FBeditor, import your settings from the box and find "tx_packetsize_in_ms" for each of your VoIP-accounts (starting with "ua1 {").
You can change it and export the settings back to the box with the FBeditor.
The box should reboot automatically after exporting the settings (it takes about 1 minute to reboot). Sometimes it does not reboot but this could happen even without the FBeditor.
If after 1 or 2 minutes nothing happens you can turn the box off and on again and everything is fine.