Nortel 1120E Administration Manual page 104

104 NAT firewall traversal
The IP Phone 1120E supports two methods for NAT traversal of the
signaling path:
•
•
The NAT traversal method can be selected manually through the Device
Settings menu or configured through the device configuration file. The
default NAT traversal method is NONE.
Copyright © 2008, Nortel Networks
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SIP_PING
STUN
SIP Firmware Release 1.1 for IP Phone 1120E Administration
NN43112-300 02.03 Standard
27 May 2008