[cisco-voip] G711 Millisecond PacketSize ?

[Tech Guy]

I am having a hard time finding good info understanding the affect and
differences in the various options here; 10, 20, and 30 for the
PreferredG711Millisecond PacketSize in the Service Parameters.

Just wondering how if anything this would affect performance over our
slower 512k WAN links?  I am unsure how you can change this for
sites/locations seeing how it is a service parameter, not even sure if
it would matter.

If anyone can point me to a good resource on this or share your own
experience I would appreciate it.

Thanks,
Dane