Avaya 9608 Administrator's Manual page 144

NAT
Network Address Translation, a mechanism by which IP addresses are mapped from one address
space to another, and in which UDP and TCP port numbers are remapped to allow multiple devices
to share the same IP address without port number conflicts.
Administering 9608/9608G/9611G/9621G/9641G IP Deskphones H.323
144
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June 2014